Firefox 技術支援討論區

I installed Firefox-ESR on my Raspberry PI and noticed that I cannot play Udemy videos. After some research I found that the Widevine plugin is missing and the OpenH264 Video Codec is also not installed. Following the instructions from similar issues didn't solve the problem. I ticked off and on the "Play DRM-controlled content" button but this only brings the widevine plugin for a moment and after that it disappears. In the network tab I see no activity when click on this button, i.e. Firefox does not send requests.

Additionally the OpenH264 Video Codec is not installed and never installs.

Any ideas how to solve this?

I was set up, in myuserchrome.css, to hide my pinned tabs on the tab bar, allowing them to still be available in the "List all tabs" menu, see first image

.tabbrowser-tab[pinned="true"] { display: none !important;}

All of a sudden, it reverted back

That first image, with the hidden tabs, is actually from Librewolf, with has the identical setting.

Hello,

I need your help: how can I set navigation bar without any item (hide all items of this bar)? I need that this bar appears but empty. The reason is that I want to restrict options in Firefox (for all users) but let it be allowed open windows pop-up.

I got remove the menu button that is to the right of the whole (hamburger type), the forward and backward buttons that are to the left of the whole (which are the arrows to the right and to the left), the detention (which is the cross), etc. I did this with commands in userChrome.css file

But what I can't hide is the item where the url's are placed (search box). I just need to hide the search box. I wrote " #nav-bar { visibility: collapse !important ; } " in userChrome.css , and then all navigation bar is hidden but don't get windows of pop-up that I need them to appear.

The version of Firefox that I have is 108.0.1 (64 bits).

Could you help me, please? It's a little urgent. Thanks!!

I'm using Firefox 85.0.2 . . . I was doing this (below), to customize my header and footer, but in this version of FF, I no longer see this in Options - only in: about:config . . . keyword "footer" . . . there, I would have to change it for 5 different ways of printing (to printers or to PDF)

I need to get rid of printing the URL in the footer - many times, it's too long, and I don't need it.

Where did the Page Setup option go?

I see in the current Print Options, you have to go to - More Settings / Margin / Custom - to see those. Why would they put this so many levels down?

It used to be: File / Page Setup / Margins & Header/Footer . . . "Customize" Headers & Footers:

Option 1 (left) . . . there are two leading spaces:

 > > &T
 > > &U . . . &D . . . &PT

Option 2 (left) . . . get rid of the ">"s, and just have the two leading spaces:

 &T
 &U . . . &D . . . &PT

I want to open online PDFs in Acrobat. I've modified the setting is in Firefox to "Always ask," yet when I click on a PDF it opens as it should AND Firefox automatically downloads the file to the Downloads folder even though that destination is greyed out in settings and the radial button for "Always Ask" is selected. How can I block this activity in either Firefox or in the registry.

NOTE: ALL OF THE SETTINGS IN FIREFOX SAY "ALWAYS ASK." This a software bug in Firefox, not a user switch setting. This activity began today (March 11, 2022) after months of normal, expected activity. I've reset Firefox and I've done a complete uninstall and clean install and this still happens.

Hello. I recently moved from windows to Linux Mint, and noticed the behavior of the Picture in Picture window is different when resizing. On windows, the aspect ratio is kept. while on Linux, it is free form, making these black bars around the video, so I have to resize it very carefully to not show any black bars.

How can I make the PiP on Linux behave like on Windows? That means resizing keeping the aspect ratio.

Attached are the comparisons between Windows and Linux Mint.

Thank you very much!

When I tap the middle mouse wheel to enable auto-scrolling (with no additional inputs like clicking, scrolling, or keyboard inputs), on release of the middle mouse wheel, auto-scroll disappears. I can only use auto-scroll while holding down the middle mouse wheel.

I've reached out to other's and this seems to not be the intended/default behavior. I've confirmed middle-mouse wheel scroll (where it's a tap / toggle) works on Chrome as well as other applications like Spotify.

I would like to have it as a toggle. What can I do?

I'm not sure what I did when using Multi Account Containers (Must have clicked "yes" to always open in a specific container when accessing Microsoft, www.office.com. I enter user name and password and Firefox containers prompts me to Always open in container and I click no. It's like I'm stuck in an endless loop, each time I enter user name, password and two-factor a new tab opens and I have to do it all over again (Never getting into office.com). However, when using private windows I am able to get in. Can I turn off, "Always open in X container"? Thank you.

Hello!

I have been using this userChrome.css code to hide the tab bar if there is only one tab (on Windows):

tab:only-of-type, tab:only-of-type + #tabs-newtab-button {

   display: none !important;

}

#tabbrowser-tabs, #tabbrowser-arrowscrollbox, #tabbrowser-tabs > .tabbrowser-arrowscrollbox {
   min-height: 0 !important;

}

Since one of the recent Firefox updates, this code does no longer work. Maybe because there is a new element in the tab bar: A drop-down list at the right.

Any idea how to make the above code work again?

Peter

This again!

This was resolved about a year ago; now the problem is back, as of updating to Firefox 113.0.1 this evening.

Initially post-update the close tab button was in a weird, random place on the tab bar. I have adjusted the margins to put the button back where it's supposed to be!

I changed :

.tabbrowser-tab .tab-close-button {
  opacity: 0;
  margin-left: -4.5px !important;
  margin-right: 2px !important;
}

to:

.tabbrowser-tab .tab-close-button {
  opacity: 0;
  margin-left: -4.5px !important;
  margin-right: 35px !important;
}

to move the button back onto the left. That may seem like a drastic change but that's the lowest value I could find which produced the result I want.

However, it's not quite the result I want! As of updating to 113.0.1, the tab title itself now disappears altogether on hover.

I have tried to correct this in CSS using the .tab-text and .tab-label attributes, but without any luck so far.

Can anybody help me with this, before I'm forced to downgrade to Firefox 112?

Better yet... how about we just make this an option in Settings, as it should be?!

Unfortunately, I downloaded “SaveFrom.net Helper” without reviewing it.

Since downloading it I have been receiving a alerts from “McAfee WebAdvisor” about “dangerous pages blocked”.

I was able to remove the “SaveFrom.net Helper” add on in Firefox, but am unable to remove the “Savefrom.net Helper” bookmark tab which has high jacked my normal Firefox Bookmarks.

I can no longer easily see my Firefox Bookmarks and have to keep opening the Firefox Application Menu, then select Bookmarks, then select Manage Bookmarks in order to see my bookmarks.

Can you please advise how I can safely remove the “SaveFrom.net Helper” bookmark tab which has high jacked my Firefox Bookmarks.

I went into setting and made sure spellcheck is enabled and it is, but there are no other options there. I did exactly what it said on your help article and right clicked in the text box on multiple different web pages and there is NO OPTION. It should not be this complicated.

Until recently, I resisted allowing updates for Firefox because of the announcements of changes to prevent access to some technical kinds of website which I use. These include the public websites of the Paris Observatory which include useul informational ftp pages with important text, data and software files.

  I did recently allow a Firefox update, and now I find that I am cut off from access to these ftp pages. 
  How can I re-enable access to ftp? If it can't be done in the new version of Firefox, how can I return to an older Firefox version that does allow such access?

I am trying to change the keyboard shortcut of the Tools → Downloads menu (opening up the downloads).

I accidentally click that sometimes and it is quite annoying, so I thought I'll switch the shortcuts to a more complex one to avoid these mistakes ^+⌘+J and when I remap that in the Keyboard preferences, the new shortcuts shows up in the menu, and it starts working but the old shortcut ⌘+J is still working.

I believe that is a bug in Firefox.

AdBlock Plus extension does not work after updating Firefox (to version 102.3.Oesr) on desktop MacPro. Deleting the preference file (pref.js) has made no difference.

This problem has not occurred after updating Firefox on my laptop Mac Book Pro.

Both computer use OS High Sierra (10.13.6).

Please advise. Thank you.

Before the new update whenever I downloaded a file it would ask where to save the file to every time, now it just asks once then automatically saves any new files I download to the same folder as the previous ones, forcing me to then go to that folder and manually move it to the correct folders. Is there any way to change it back to the right way it was done before they decided to remove our choice? My setting is set to "Always ask you where to save files", with the emphasis on "Always".