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I view a lot of pdf documents via firefox, the light gray background makes my eyes and head hurt after prolonged usage. In the past I found a solution on this forum that advised to set pdfjs.viewerCssTheme to "2" in about:config. This set the background of pdf viewer to black/dark gray. This has worked for years until recently when the pdf viewer switched to light mode again (pic 1). I checked the about:config settings for pdfjs.viewerCssTheme but there appears to be no change. I tried restarting the browser, setting the theme to 0 and to 2 again, updating browser. Sadly the theme is still light gray. Is there a way to change it again? The desired outcome is in pic 2. I do NOT want to change the color of the pdf pages themselves.

After last update, Missing "TRASH" folder and only have Junk Folder that everything is put in and marked as "Junk". Then those messages are all marked as "junk" automatically that may not be Junk. Tried to create subfolder named "Trash" and will not allow. Windows 10, 64 bit Dell laptop I-5 Inspiron 5759.

When I type my last name using shift + first letter, it always comes out in lower case, which wastes my time correcting. How do I set it back to using upper case with shift +?

Thank you.

I've always liked the Firefox New Tab page, with Pocket, and until today, DarkReader plugin has always worked. But now it says that it can't because the page is protected.

I tried the solution to use bookmarklets, suggested in https://support.mozilla.org/en-US/questions/1350781, but it didn't have any effect (https://sanketmehta7.github.io/DarkMode-JS-BookMark/

If I can't find a solution, I'll just ditch Pocket, and use Google as my first page, or something. Or maybe ditch Firefox, which doesn't seem to think that dark mode is important. I don't like being blinded by the light.

Firefox won't play YouTube videos. I've tried everything. There seem to be plenty of problems on the forum BUT NO SOLUTIONS!

I'm ready to switch browsers - permanently!

As long as I have an incognito window open, Firefox will reopen old tabs everytime I open a new "regular" window, even if "Open previous windows and tabs" is unchecked.

Why can't you pin the extension 'Tiny URL' to the toolbar any more?

This extension is really useful! I don't want to have to excavate Firefox to use it.

Tiny URL is more useful than the rather silly 'Pocket' which just seems to be a page full of adverts

My Get Messages is grayed out, how do I fix? Not downloading messages I searched the answers for this and tried what was suggested and now the Mail Toolbar is completely gone, the suggestion was to Restore Default setting and I did and now my Toolbar is completely gone

Firefox for Linux has a bug where it is unable to drag a tab from a non-active window. As in, if the window focus is on Firefox window A and I try to drag a tab from Firefox window B to window A, I have to click first the window. I can't just intuitively drag the tab from a non-active window, because it will get ignored. It will just activate the window, ignoring the drag.

Firefox for Linux, running on Nobara KDE latest desktop. Confirmed also on KDE Neon latest desktop.

In about.config i set javascript.enabled false for most browsing, unless i really need to do otherwise (e.g. ecommerce). If i close the app (menu quit), and restart it, javacript.enabled is reset true. This behaviour is not replicated for other settings i may make, e.g. dom.storage.enabled, or permissions.default.image. Being Android i have no root so no possibility of creating a user.js to override Firefox ignoring my settings. This seems to be a bug. Version is Android Nightly version 121.0a1, 2023-11-05.

Starting this morning I suddenly cant delete or mark emails as read in Outlook.live.com. Even if I open an email, and it appears as read after that, if I refresh or leave the page and come back, its marked as read again.

I tried dropping all add-ons (a kill switch to drop all add-ons and re-activate them is still a feature I feel Firefox needs, I have to click every single one of them every time) to no avail.

I was in the process of writing this question on the Microsoft forums (which is usually like whizzing in the wind) when I thought to try a different browser. I had zero issues and Outlook.live.com worked perfectly normal on Microsoft Edge.

This HAS to be a bug in a recent update in Firefox

The Amazon.co.uk search plugin was working but now its not and when i try to click "add search engine" a box pops up with

Firefox could not download the search plugin from: https://d2lo25i6d3q8zm.cloudfront.net/browser-plugins/AmazonSearchSuggestionsOSD.Firefox.xml

another post suggested checking the about:config browser.search.region mine says "GB" which would be correct for .co.uk

All other search plugins work fine. Any suggestions?

I am accessing my ISP to download the security software. I need to be able to select the Operating System. When I click on the drop down box I am prompted for the OS, but when I select it the drop down box does not populate. I then get a message to select the OS. This works with Microsoft Edge.

Hi there - I accepted Firefox's prompt to "refresh" the browser and had no idea it would take away my add-ons. How do I get these back? I don't even remember what they all were, but I know they made a huge difference and now I can't believe all the ads I'm seeing and then my "facebook container" (and other kinds of container tabs) is gone too! How do I fix this? Can I undo the "refresh"??

Why do Cross Site tracking cookies show up after I shut down the browser and restart? I have my history set up to delete everything when I close the browser so I'm curious why cross site cookies are apparently allowed to exist/function, even after a restart?

Dano