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How to effectively save a page after having converted it using reader-viewer?

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I used Firefox 61.0.1 on Linux Mint.

Firefox's reader viewer removes clutter from web pages. It works fine online, but save pages come out blank offline. if you open with a text a editor, you can see they contain the text.

Is there a way to fix this?

Screenshots:

Saved original page displayed in browser; Saved reader-viewer page displayed in browser; The files with their size.

Truncated content of the saved html page with reader-viewer:

<meta content="default-src chrome:; img-src *; media-src *" http-equiv="Content-Security-Policy"> <meta content="text/html; charset=UTF-8" http-equiv="content-type"> <meta content="width=device-width; user-scalable=0" name="viewport"> <link href="List%20of%20compositions%20by%20Johann%20Sebastian%20Bach_files/aboutReader.css" rel="stylesheet" type="text/css"> <script src="List%20of%20compositions%20by%20Johann%20Sebastian%20Bach_files/aboutReader.js" type="text/javascript"></script> <link href="List%20of%20compositions%20by%20Johann%20Sebastian%20Bach_files/narrate.css" rel="stylesheet"><title>List of compositions by Johann Sebastian Bach</title><link href="https://en.wikipedia.org/static/favicon/wikipedia.ico" rel="shortcut icon">

en.wikipedia.org

List of compositions by Johann Sebastian Bach


1. Cantatas (see also: List of Bach cantatas, Church cantata (Bach) and List of secular cantatas by Johann Sebastian Bach) Up ↑ 1 1. 1725-03-25 Cantata Wie schön leuchtet der Morgenstern (Annunciation) F major stbSATB 2Hn 2Odc 2Vl Str Bc 1: 1 I/28.2: 3 0001 2 1. 1724-06-18 Cantata Ach Gott, vom Himmel sieh darein (Trinity II) G minor atbSATB 4Tbn 2Ob Str Bc 1: 53 I/16: 81 0002 3 1. 1725-01-14 Cantata Ach Gott, wie manches Herzeleid (Epiphany II) A major satbSATB Hn Tbn 2Oba Str Bc 1: 73 I/5: 189 0003 4.2 1. 1724-04-09 Cantata Christ lag in Todes Banden (Easter) E minor satbSATB Cnt 3Tbn Str Bc 1: 95 I/9: 1 text by Luther; after BWV 4.1 0004 4.1 1. 1707-04-24 Cantata Christ lag in Todes Banden (Easter; early version, lost) satbSATB 2Vl 2Va Bc I/9 text by Luther; → BWV 4.2 0005 5 1. 1724-10-15 Cantata Wo soll ich fliehen hin (Trinity XIX) G minor satbSATB Tdt 2Ob Str Bc 1: 125 I/24: 133 0006 6 1. 1725-04-02 Cantata Bleib bei uns, denn es will Abend werden (Easter 2) C minor satbSATB 2Ob Odc Str Vc Bc 1: 151 I/10: 43 → BWV 649 0007 7 1. 1724-06-24 Cantata Christ unser Herr zum Jordan kam (24 June: feast of John the Baptist) E minor atbSATB 2Oba 2Vl Str Bc 1: 177 I/29: 25 0008 8.1 1. 1724-09-24 Cantata Liebster Gott, wenn werd ich sterben? (Trinity XVI; 1st version) E major satbSATB Hn Fl Fl 2Oba Str Bc 1: 211 I/23: 105 → BWV 8.2 0009 8.2 1. 1747-09-17 Cantata Liebster Gott, wenn werd ich sterben? (Trinity XVI; 2nd version) D major satbSATB Fl 2Oba Tai 2Vl Str Bc I/23: 163 after BWV 8.1 0010 9 1. 1732-07-20 Cantata Es ist das Heil uns kommen her (Trinity VI) E major satbSATB Fl Oba Str Bc 1: 243 I/17.2: 83 → BWV 648 0011 10 1. 1724-07-02 Cantata Meine Seel erhebt den Herren a.k.a. German Magnificat (Visitation) G minor satbSATB Tr 2Ob Str Bc 1: 275 I/28.2: 131 0012 12 1. 1714-04-22

1724-04-30

Cantata Weinen, Klagen, Sorgen, Zagen (Jubilate; two versions) F Dorian

G minor

atbSATB Tr Ob 2Vl 2Va Bas Bc 2: 59

I used Firefox 61.0.1 on Linux Mint. Firefox's reader viewer removes clutter from web pages. It works fine online, but save pages come out blank offline. if you open with a text a editor, you can see they contain the text. Is there a way to fix this? Screenshots: Saved original page displayed in browser; Saved reader-viewer page displayed in browser; The files with their size. Truncated content of the saved html page with reader-viewer: <!DOCTYPE html> <html><head> <meta http-equiv="Content-Security-Policy" content="default-src chrome:; img-src *; media-src *"> <meta content="text/html; charset=UTF-8" http-equiv="content-type"> <meta name="viewport" content="width=device-width; user-scalable=0"> <link rel="stylesheet" href="List%20of%20compositions%20by%20Johann%20Sebastian%20Bach_files/aboutReader.css" type="text/css"> <script type="text/javascript" src="List%20of%20compositions%20by%20Johann%20Sebastian%20Bach_files/aboutReader.js"></script> <link rel="stylesheet" href="List%20of%20compositions%20by%20Johann%20Sebastian%20Bach_files/narrate.css"><title>List of compositions by Johann Sebastian Bach</title><link rel="shortcut icon" href="https://en.wikipedia.org/static/favicon/wikipedia.ico"></head> <body class="light sans-serif loaded"> <div class="container font-size5 content-width3"> <div class="header reader-header" style="display: block;" dir="ltr"> <a class="domain reader-domain" href="https://en.wikipedia.org/wiki/List_of_compositions_by_Johann_Sebastian_Bach">en.wikipedia.org</a> <div class="domain-border"></div> <h1 class="reader-title">List of compositions by Johann Sebastian Bach</h1> <div class="credits reader-credits"></div> <div class="meta-data"> <div class="reader-estimated-time" dir="ltr" style="text-align: left;">208-251 minutes</div> </div> </div> <hr> <div class="content"> <div class="moz-reader-content line-height4" style="display: block;" dir="ltr"><div id="readability-page-1" class="page"><div> <b>1.</b> Cantatas (see also: <a href="https://en.wikipedia.org/wiki/List_of_Bach_cantatas" title="List of Bach cantatas">List of Bach cantatas</a>, <a href="https://en.wikipedia.org/wiki/Church_cantata_(Bach)" title="Church cantata (Bach)">Church cantata (Bach)</a> and <a href="https://en.wikipedia.org/wiki/List_of_secular_cantatas_by_Johann_Sebastian_Bach" title="List of secular cantatas by Johann Sebastian Bach">List of secular cantatas by Johann Sebastian Bach</a>) <a href="#TOP">Up ↑</a> 1 1. 1725-03-25 <a href="https://en.wikipedia.org/wiki/BWV_1" title="BWV 1">Cantata <i>Wie schön leuchtet der Morgenstern</i></a> (Annunciation) F major stbSATB 2Hn 2Odc 2<b>Vl</b> Str Bc <a href="https://imslp.org/wiki/Wie_sch%C3%B6n_leuchtet_der_Morgenstern,_BWV_1_(Bach,_Johann_Sebastian)" title="scores:Wie schön leuchtet der Morgenstern, BWV 1 (Bach, Johann Sebastian)">1: 1</a> I/28.2: 3 <a rel="nofollow" href="http://www.bachdigital.de/receive/BachDigitalWork_work_00000001?lang=en">0001</a> 2 1. 1724-06-18 <a href="https://en.wikipedia.org/wiki/BWV_2" title="BWV 2">Cantata <i>Ach Gott, vom Himmel sieh darein</i></a> (Trinity&nbsp;II) G minor atbSATB 4Tbn 2Ob Str Bc <a href="https://imslp.org/wiki/Ach_Gott,_vom_Himmel_sieh_darein,_BWV_2_(Bach,_Johann_Sebastian)" title="scores:Ach Gott, vom Himmel sieh darein, BWV 2 (Bach, Johann Sebastian)">1: 53</a> I/16: 81 <a rel="nofollow" href="http://www.bachdigital.de/receive/BachDigitalWork_work_00000002?lang=en">0002</a> 3 1. 1725-01-14 <a href="https://en.wikipedia.org/wiki/BWV_3" title="BWV 3">Cantata <i>Ach Gott, wie manches Herzeleid</i></a> (Epiphany&nbsp;II) A major satbSATB Hn Tbn 2Oba Str Bc <a href="https://imslp.org/wiki/Ach_Gott,_wie_manches_Herzeleid,_BWV_3_(Bach,_Johann_Sebastian)" title="scores:Ach Gott, wie manches Herzeleid, BWV 3 (Bach, Johann Sebastian)">1: 73</a> I/5: 189 <a rel="nofollow" href="http://www.bachdigital.de/receive/BachDigitalWork_work_00000003?lang=en">0003</a> 4.2 1. 1724-04-09 <a href="https://en.wikipedia.org/wiki/BWV_4" title="BWV 4">Cantata <i>Christ lag in Todes Banden</i></a> (Easter) E minor satbSATB Cnt 3Tbn Str Bc <a href="https://imslp.org/wiki/Christ_lag_in_Todesbanden,_BWV_4_(Bach,_Johann_Sebastian)" title="scores:Christ lag in Todesbanden, BWV 4 (Bach, Johann Sebastian)">1: 95</a> I/9: 1 text by <a href="https://en.wikipedia.org/wiki/Martin_Luther" title="Martin Luther">Luther</a>; after <a href="https://en.wikipedia.org/wiki/BWV_4" title="BWV 4">BWV&nbsp;4</a>.1 <a rel="nofollow" href="http://www.bachdigital.de/receive/BachDigitalWork_work_00000004?lang=en">0004</a> 4.1 1. 1707-04-24 <a href="https://en.wikipedia.org/wiki/BWV_4" title="BWV 4">Cantata <i>Christ lag in Todes Banden</i></a> (Easter; early version, lost) satbSATB 2Vl 2Va Bc I/9 text by <a href="https://en.wikipedia.org/wiki/Martin_Luther" title="Martin Luther">Luther</a>; → <a href="https://en.wikipedia.org/wiki/BWV_4" title="BWV 4">BWV&nbsp;4</a>.2 <a rel="nofollow" href="http://www.bachdigital.de/receive/BachDigitalWork_work_00000005?lang=en">0005</a> 5 1. 1724-10-15 <a href="https://en.wikipedia.org/wiki/BWV_5" title="BWV 5">Cantata <i>Wo soll ich fliehen hin</i></a> (Trinity&nbsp;XIX) G minor satbSATB Tdt 2Ob Str Bc <a href="https://imslp.org/wiki/Wo_soll_ich_fliehen_hin,_BWV_5_(Bach,_Johann_Sebastian)" title="scores:Wo soll ich fliehen hin, BWV 5 (Bach, Johann Sebastian)">1: 125</a> I/24: 133 <a rel="nofollow" href="http://www.bachdigital.de/receive/BachDigitalWork_work_00000006?lang=en">0006</a> 6 1. 1725-04-02 <a href="https://en.wikipedia.org/wiki/BWV_6" title="BWV 6">Cantata <i>Bleib bei uns, denn es will Abend werden</i></a> (Easter&nbsp;2) C minor satbSATB 2Ob Odc Str Vc Bc <a href="https://imslp.org/wiki/Bleib_bei_uns,_denn_es_will_Abend_werden,_BWV_6_(Bach,_Johann_Sebastian)" title="scores:Bleib bei uns, denn es will Abend werden, BWV 6 (Bach, Johann Sebastian)">1: 151</a> I/10: 43 → <a href="https://en.wikipedia.org/wiki/BWV_649" title="BWV 649">BWV 649</a> <a rel="nofollow" href="http://www.bachdigital.de/receive/BachDigitalWork_work_00000007?lang=en">0007</a> 7 1. 1724-06-24 <a href="https://en.wikipedia.org/wiki/BWV_7" title="BWV 7">Cantata <i>Christ unser Herr zum Jordan kam</i></a> (24 June: feast of John the Baptist) E minor atbSATB 2Oba 2<b>Vl</b> Str Bc <a href="https://imslp.org/wiki/Christ_unser_Herr_zum_Jordan_kam,_BWV_7_(Bach,_Johann_Sebastian)" title="scores:Christ unser Herr zum Jordan kam, BWV 7 (Bach, Johann Sebastian)">1: 177</a> I/29: 25 <a rel="nofollow" href="http://www.bachdigital.de/receive/BachDigitalWork_work_00000008?lang=en">0008</a> 8.1 1. 1724-09-24 <a href="https://en.wikipedia.org/wiki/BWV_8" title="BWV 8">Cantata <i>Liebster Gott, wenn werd ich sterben?</i></a> (Trinity&nbsp;XVI; 1st version) E major satbSATB Hn Fl Fl 2Oba Str Bc <a href="https://imslp.org/wiki/Liebster_Gott,_wenn_werd_ich_sterben%3F,_BWV_8_(Bach,_Johann_Sebastian)" title="scores:Liebster Gott, wenn werd ich sterben?, BWV 8 (Bach, Johann Sebastian)">1: 211</a> I/23: 105 → <a href="https://en.wikipedia.org/wiki/BWV_8" title="BWV 8">BWV 8</a>.2 <a rel="nofollow" href="http://www.bachdigital.de/receive/BachDigitalWork_work_00000009?lang=en">0009</a> 8.2 1. 1747-09-17 <a href="https://en.wikipedia.org/wiki/BWV_8" title="BWV 8">Cantata <i>Liebster Gott, wenn werd ich sterben?</i></a> (Trinity&nbsp;XVI; 2nd version) D major satbSATB Fl 2Oba Tai 2<b>Vl</b> Str Bc I/23: 163 after <a href="https://en.wikipedia.org/wiki/BWV_8" title="BWV 8">BWV 8</a>.1 <a rel="nofollow" href="http://www.bachdigital.de/receive/BachDigitalWork_work_00000010?lang=en">0010</a> 9 1. 1732-07-20 <a href="https://en.wikipedia.org/wiki/BWV_9" title="BWV 9">Cantata <i>Es ist das Heil uns kommen her</i></a> (Trinity&nbsp;VI) E major satbSATB Fl Oba Str Bc <a href="https://imslp.org/wiki/Es_ist_das_Heil_uns_kommen_her,_BWV_9_(Bach,_Johann_Sebastian)" title="scores:Es ist das Heil uns kommen her, BWV 9 (Bach, Johann Sebastian)">1: 243</a> I/17.2: 83 → <a href="https://en.wikipedia.org/wiki/BWV_648" title="BWV 648">BWV 648</a> <a rel="nofollow" href="http://www.bachdigital.de/receive/BachDigitalWork_work_00000011?lang=en">0011</a> 10 1. 1724-07-02 <a href="https://en.wikipedia.org/wiki/BWV_10" title="BWV 10">Cantata <i>Meine Seel erhebt den Herren</i></a> a.k.a. <i>German Magnificat</i> (Visitation) G minor satbSATB Tr 2Ob Str Bc <a href="https://imslp.org/wiki/Meine_Seel_erhebt_den_Herren,_BWV_10_(Bach,_Johann_Sebastian)" title="scores:Meine Seel erhebt den Herren, BWV 10 (Bach, Johann Sebastian)">1: 275</a> I/28.2: 131 <a rel="nofollow" href="http://www.bachdigital.de/receive/BachDigitalWork_work_00000012?lang=en">0012</a> 12 1. 1714-04-22 <hr> <p>1724-04-30 </p> <a href="https://en.wikipedia.org/wiki/BWV_12" title="BWV 12">Cantata <i>Weinen, Klagen, Sorgen, Zagen</i></a> (Jubilate; two versions) F <a href="https://en.wikipedia.org/wiki/Dorian_mode" title="Dorian mode">Dorian</a> <hr> <p>G minor </p> atbSATB Tr Ob 2Vl 2Va Bas Bc <a href="https://imslp.org/wiki/Weinen,_Klagen,_Sorgen,_Zagen,_BWV_12_(Bach,_Johann_Sebastian)" title="scores:Weinen, Klagen, Sorgen, Zagen, BWV 12 (Bach, Johann Sebastian)">2: 59</a> <hr>
Attached screenshots

Additional System Details

Installed Plug-ins

  • Shockwave Flash 30.0 r0

Application

  • User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:61.0) Gecko/20100101 Firefox/61.0

More Information

jscher2000
  • Top 10 Contributor
8634 solutions 70618 answers

Hmm, if you use the "Web page, Complete" format, it should work. (The "Web page, HTML Only" format does NOT work.)

If you use

(menu bar) View > Page Style > No Style

do you get a giant dump of all the text in the page?

If that works, it seems to indicate some problem laying it out using the standard reader view style sheet.

Hmm, if you use the "Web page, Complete" format, it should work. (The "Web page, HTML Only" format does NOT work.) If you use (menu bar) View > Page Style > No Style do you get a giant dump of all the text in the page? If that works, it seems to indicate some problem laying it out using the standard reader view style sheet.

Question owner

jscher2000 said

Hmm, if you use the "Web page, Complete" format, it should work. (The "Web page, HTML Only" format does NOT work.)

Thanks, but not it does not solve the problem.

I made sure the Complete option was selected (it is by default in my case), and when you clike the saved html, it opens a blank page. Not with the original html, only after converting the page using reader-viewer.

The file sizes are shown in the third attachment.

''jscher2000 [[#answer-1150157|said]]'' <blockquote> Hmm, if you use the "Web page, Complete" format, it should work. (The "Web page, HTML Only" format does NOT work.) </blockquote> Thanks, but not it does not solve the problem. I made sure the Complete option was selected (it is by default in my case), and when you clike the saved html, it opens a blank page. Not with the original html, only after converting the page using reader-viewer. The file sizes are shown in the third attachment.
jscher2000
  • Top 10 Contributor
8634 solutions 70618 answers

Yes, we're on the same page about the way you need to save and the way you did save.

Did you try turning off style rules to see what happens?

Can you think of any add-ons that could be modifying the page?

Yes, we're on the same page about the way you need to save and the way you did save. Did you try turning off style rules to see what happens? Can you think of any add-ons that could be modifying the page?

Question owner

jscher2000 said

Yes, we're on the same page about the way you need to save and the way you did save.

Sorry, we are not on the same page. If I knew how to do what I want, I would not be posting about it.

''jscher2000 [[#answer-1150182|said]]'' <blockquote> Yes, we're on the same page about the way you need to save and the way you did save. </blockquote> Sorry, we are not on the same page. If I knew how to do what I want, I would not be posting about it.
jscher2000
  • Top 10 Contributor
8634 solutions 70618 answers

Here's what I meant: You saved the file the same way I did, mine shows the text, yours does not. This part is all settled.

Can you please focus on my second question now?

Here's what I meant: You saved the file the same way I did, mine shows the text, yours does not. This part is all settled. Can you please focus on my second question now?

Question owner

jscher2000 said

Here's what I meant: You saved the file the same way I did, mine shows the text, yours does not. This part is all settled.

OK, sorry

Can you please focus on my second question now?

I don't understand it. Obviously, Reader is modifying the page, which is as intended, online. Why is the page saved after toggling to the Reader blank? That's my question.

I have only 3 add-ons and the two others are neither running nor likely to interfere.

''jscher2000 [[#answer-1150194|said]]'' <blockquote> Here's what I meant: You saved the file the same way I did, mine shows the text, yours does not. This part is all settled. </blockquote> OK, sorry <blockquote> Can you please focus on my second question now? </blockquote> I don't understand it. Obviously, Reader is modifying the page, which is as intended, online. Why is the page saved after toggling to the Reader blank? That's my question. I have only 3 add-ons and the two others are neither running nor likely to interfere.

Question owner

Does the problem not replicate on other machines?

https://en.wikipedia.org/wiki/List_of_compositions_by_Johann_Sebastian_Bach

Does the problem not replicate on other machines? https://en.wikipedia.org/wiki/List_of_compositions_by_Johann_Sebastian_Bach
jscher2000
  • Top 10 Contributor
8634 solutions 70618 answers

Helpful Reply

erw1 said

Does the problem not replicate on other machines? https://en.wikipedia.org/wiki/List_of_compositions_by_Johann_Sebastian_Bach

This was the result of my test (screenshot attached). I already updated this morning, but I don't know if that makes a difference.

''erw1 [[#answer-1150199|said]]'' <blockquote> Does the problem not replicate on other machines? https://en.wikipedia.org/wiki/List_of_compositions_by_Johann_Sebastian_Bach </blockquote> This was the result of my test (screenshot attached). I already updated this morning, but I don't know if that makes a difference.

Question owner

Thanks.

Here are the Reader files, as saved on my machine:

https://expirebox.com/download/b29dfaf8f6fd0c238f4425f6da33ef7f.html

Would someone mind checking how they work on their machine?

Thanks. Here are the Reader files, as saved on my machine: https://expirebox.com/download/b29dfaf8f6fd0c238f4425f6da33ef7f.html Would someone mind checking how they work on their machine?
jscher2000
  • Top 10 Contributor
8634 solutions 70618 answers

Sorry, Firefox won't let me download the file, says it contains a virus. That can happen if you use a file hosting site with a bad reputation, even if the file itself is clean.

But you already confirmed the text is in the file. How does it display in your other browser(s)?

Sorry, Firefox won't let me download the file, says it contains a virus. That can happen if you use a file hosting site with a bad reputation, even if the file itself is clean. But you already confirmed the text is in the file. How does it display in your other browser(s)?

Question owner

I'll try on Windows another day. Meanwhile here's the same file uploaded to Google Drive:

https://drive.google.com/open?id=139sU6riuYqu83rBlB44XlCVGXUWHZ4g4

I'll try on Windows another day. Meanwhile here's the same file uploaded to Google Drive: https://drive.google.com/open?id=139sU6riuYqu83rBlB44XlCVGXUWHZ4g4

Question owner

PS: I don't have another browser on Linux.

PS: I don't have another browser on Linux.
jscher2000
  • Top 10 Contributor
8634 solutions 70618 answers

Thanks for the file. There is a key difference on the title div and main content div:

Mine:

<div class="header reader-header reader-show-element" dir="ltr">

<div class="moz-reader-content line-height3 reader-show-element" dir="ltr">

Yours:

<div class="header reader-header" style="display: block;" dir="ltr">

<div class="moz-reader-content line-height4" style="display: block;" dir="ltr">

I don't know what is causing that difference, but it might be related to my using Firefox 62.

When viewed in the browser, the display: block; gets stripped from your tags, returning the content to a hidden state.

That seems to be caused by a Content Security Policy (CSP) restriction in the page that is inactive when you view the page directly from the server, but takes over in a saved file (this is the second line of the file):

<meta http-equiv="Content-Security-Policy" content="default-src chrome:; img-src *; media-src *">

While you can defeat this by completely disabling CSP in Firefox, that's not a safe way to browse.

As a crude "hack-around," you could try this snippet of code to restore the stripped style rule. To apply it, open the Web Console using either:

  • "3-bar" menu button > Web Developer > Web Console
  • (menu bar) Tools > Web Developer > Web Console
  • (Linux) Ctrl+Shift+k

Then paste this line of script in the blank at the bottom and press Enter/Return to execute it. The first time, Firefox should warn you that it's dangerous to run code from strangers and make you acknowledge that before you can run it.

document.querySelector('div.header.reader-header').style.display = 'block'; document.querySelector('div.moz-reader-content').style.display = 'block';

If you have a lot of these pages, a user script or bookmarklet would be much more convenient.

Or a bulk text-file editor could remove that CSP line from the files you saved from Wikipedia.

Thanks for the file. There is a key difference on the title div and main content div: ''Mine:'' &lt;div class="header reader-header '''reader-show-element'''" dir="ltr"> &lt;div class="moz-reader-content line-height3 '''reader-show-element'''" dir="ltr"> ''Yours:'' &lt;div class="header reader-header" '''style="display: block;"''' dir="ltr"> &lt;div class="moz-reader-content line-height4" '''style="display: block;"''' dir="ltr"> I don't know what is causing that difference, but it might be related to my using Firefox 62. When viewed in the browser, the '''display: block;''' gets stripped from your tags, returning the content to a hidden state. That seems to be caused by a Content Security Policy (CSP) restriction in the page that is inactive when you view the page directly from the server, but takes over in a saved file (this is the second line of the file): &lt;meta http-equiv="Content-Security-Policy" content="default-src chrome:; img-src *; media-src *"> While you can defeat this by completely disabling CSP in Firefox, that's not a safe way to browse. As a crude "hack-around," you could try this snippet of code to restore the stripped style rule. To apply it, open the Web Console using either: * "3-bar" menu button > Web Developer > Web Console * (menu bar) Tools > Web Developer > Web Console * (Linux) Ctrl+Shift+k Then paste this line of script in the blank at the bottom and press Enter/Return to execute it. The first time, Firefox should warn you that it's dangerous to run code from strangers and make you acknowledge that before you can run it. <code>document.querySelector('div.header.reader-header').style.display = 'block'; document.querySelector('div.moz-reader-content').style.display = 'block';</code> If you have a lot of these pages, a user script or bookmarklet would be much more convenient. Or a bulk text-file editor could remove that CSP line from the files you saved from Wikipedia.