Firefox 技術支援討論區

Hey there,

Since upgrading to Firefox v100 a few weeks ago I've had incessant problems every time I reboot my laptop.

If I leave Firefox running (i.e. I just hit shutdown and let it sort itself out) then next time I boot up, and I try to open Firefox for it to load my prior session, it spawns a new window and just gets stuck forever. If I close Firefox before shutting down, however, it reloads itself just fine.

This has led to several lost sessions and having to restore using sessionstore, either when laptop has died or I've just shut the laptop down without thinking about it.

I run Kubuntu 20.04.

Thanks Chris

Firefox says I need a video codec to play a video (that is aparently somewhere on the page). It does NOT tell me what video, what video format, or what codec I need. How do I find out what codec I need?

Firefox version: 101.0 (64 bit) OS: Fedora 36

I can't play a video when logged into a website - see https://support.mozilla.org/en-US/questions/1371380

I'm sure it is not Firefox as I have also tried Chrome and Opera; same problem. How can I debug this and find out why the video cannot be played ?

I see there is 'Remote Debugging' and 'Browser Console' under 'More Tools'. How do I use these or other tools to find out what is causing the problem please ?

I've read through quite a few posts on this error. Disabled the only extension, and followed guidlines on how to disable tracking protection. I still get the error message.

[quote]Firefox Can’t Open This Page

To protect your security, vimeo.com will not allow Firefox to display the page if another site has embedded it. To see this page, you need to open it in a new window.

Learn more…

Report errors like this to help Mozilla identify and block malicious sites/quote

Have tried the 'Open site in new window', it goes to a Vimeo video and then an error message ..

[quote]Sorry, we couldn’t find that page

Make sure you’ve typed the URL correctly, or try searching Vimeo. You could also watch one of the videos below instead./quote

Even though when I hover the mouse over the 'shield' and the display is "Enhanced tracking protection is off for this site", the error still comes up. I go into settings and the 'Managed Exceptions' shows no entries. Shouldn't there be an exception in there for the site I am attempting to view a video from ? There is no method to add a site manually.

Firefox 101.0.1 (64-bit) on Kubuntu (linux)

Hello

I want to open pdfs from firefox (snap 101.0.1) with the default application of the system (Xubuntu 22.04) and not open them in a new tab within forefox.

But it does not work, as if there was a problem with the system handler but only for pdfs and not for other file formats.

More details :

• I changed Preferences/general/Applications for pdfs to use either "always ask" (and then chose "open" " With system handler" when asked) or "default system application". In both cases the pdf is downloaded but not opened. If I right click on the downloaded pdf in the list of downloaded files and then chose "open with system handler", nothing happens.
• Opening the pdf inside Firefox works well and opening pdfs saved on my disk (outside firefox) as well.
• Opening other file format by choosing to open them from firefox with the system handler works well too (tested eg with .torrent, .xls, .tif,...).
• I tried to change the default system application for pdf (Atril) to other softwares without success (Okular, Evince).
• If I try to open a .djvu file with the "system handler" it is opened correctly using Atril which is the also default for pdfs... So Atril works for .djvu files but not for pdfs...
• I tried to replace the handlers.json file from my profile by a handler.json file from a brand new profile, without success (I still have a backup of my old profile file if needed). I did that because opening with the system application worked before and the bug appeared after I changed all applications preferences to "always ask" (and there were a lot of them in my rather old handlers.json file).

I'm lost...

I am trying to download a spreadsheet file which has a .xlsx extension. Firefox insists on downloading the file (my default action) but I want to be given the option to open in my spreadsheet program (Libreoffice).

Looking in Settings and scrolling down to Files and Applications -> Applications, there are other spreadsheet formats present but not one for .xlsx. How do I add the "Always Ask" option for .xlsx files?

Libreoffice is the default system application for opening these files.

Reinstalled Firefox on Ubuntu 20 and signed back into my Firefox account and I don't have any of my passwords, bookmarks or extensions, I'm extremely upset - there's very important info I lost!

I recently did a fresh install of Firefox, and now picture-in-picture videos are defaulting always to the top-left corner of the screen and to not stay always on top; each time I open a video or refresh the page and re-start picture-in-picture it reverts to these defaults and I have to manually change it each time. Previously the default had been always on top and would show up in the location & at the size of my previous usage. I would like to adjust the default settings to make that happen again, but I can't find where to do that. I'd appreciate information on how to do this. Thank you!

I'm using Firefox Version 98.0.2 on Ubuntu 21.10 with Wayland and Gnome 40.4.0. I choose a larger cursor size from Ubuntu's Settings->Accessibility->Cursor Size. However, in Firefox the cursor always displayed in the smallest size.

For some reason, whenever I load a pdf from within Firefox, I get a new tab with the regular toolbar displayed on top of pdf files, but the document itself is completely blank (see attached screenshot). This issue just started today and I assume it was a result of an update, since I don't recall making any changes to my settings (I'm using Firefox 101.0.1 on Ubuntu 20.04).

I've tried opening multiple files from a variety of sites with the same result. All of them open fine using my system's pdf viewer, as well as from within Chromium. I've tried disabling my plugins, putting Firefox into safe mode and resetting all the handlers, to no avail. Any help would be much appreciated.

So I have been some issues with my Debian bookworm (Gnome bugged out) and changed to Sparky ( not a massive update I know, it's the same repo anyway) . Once Sparky Firefox upgraded to the latest version, I noticed some interesting behavior (tor running in the background and etc). I wasn't careful with playing gods with storage & cache, so had to again reinstall sparky. To my surprise my all passwords, bookmarks. add-ons are gone. I had just one account (was also using the dev browser for some time), so really it's awkward ad upsetting situation, any troubleshooting steps you can suggest?

Firefox allow to disable access to canvas for lowering fingerprinting, it's cool !

But as web developer : i like to ask this access before try to using it,

Something like :

1. Do you alllow canvas ? 2. Show the browser part 3. Wait for user answer 4. It's OK : download PDF done with canvass 5. It's not OK : shown an error to user.

To avoid such situation (see screencast)

I'd like to watch the episodes I missed of Suspect on Channel 4.

When attempting to do so, I get a 'Digital Rights Management (DRM) Not Enabled' message, even though it is enabled in Preferences!

Google Widevine plugin is also activated

Any ideas please?

TIA

Tony

Until recently, whenever I downloaded a file, the Firefox dialogue requesting the destination folder started out at the folder I last used to download a file from that web site. Now it appears to always start in the last used folder, independent of web site. Since I seldom download more than one file at a time from a given web site, this means I have to navigate the directory tree for every download, which makes the whole process take two or three times as long as it used to. Is there any way to restore the old behavior? My searches on the web have only turned up suggestions that are accompanied by responses that say "That didn't work." (Running 101.0.1 on Ubuntu 18.04, if that matters.)

I know there are add-ons that will let me script the download folder selection process, and I'll go that route if I must, but I'm hoping that my preferred browser behavior is still available - "just works" is preferable to "you can beat it into submission if you try hard enough".

I accident clicked delete download when from my downloads list in firefox and I can't find it anywhere on my computer? Does anyone now how I restore this file to save the time having to re download it? I am using Ubuntu.