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I've noticed that when video media begins to play, it often suddenly slows down the entire browser's processing ability and cuts to strange visual glitches limited to just the video window, usually green and pink pixelated glitches. This doesn't happen on YouTube, nor does it happen when I use other browsers like Edge. I'm on Windows 11, using the latest Firefox version, with Strict privacy settings and a reliable and simple adblock. Had the same setup on a previous Windows 10 laptop and did not have these issues. It's getting frustrating and is impacting my experience with this browser across multiple websites. I refuse to switch back to sketchy, predatory browsers like Chrome and Edge, so I hope this can be fixed, either on my end or on Mozilla's. Thanks! (Attached a screenshot of the visual glitches.)

On some websites, the ligatures for ff, fi, fl, and others are scrambling with other font rendering behaviors.

I can most clearly test this on the mobile version of wikipedia (normal wikipedia doesn't have this problem since it uses a different font), but there are other sites experiencing the same issues. The issues are as follows:

1. Typing "fl" renders as "ft" instead.
2. Typing "fi" renders as "ff."
3. Typing "ffl" attaches an accent to the preceding character.
4. Typing "ffi" renders as an uncommon "st" ligature.

I have attached images showing each of these rendering issues. Note that the titles are not bugged, because they're being rendered in a Sans Serif font.

I am only getting this issue on Firefox. Other browsers like librewolf do not have this problem. Still, I tried reinstalling Roboto, and it did not solve the issue. I am running Arch Linux on the X window system.

Hello!

I am reaching out regarding an issue I am having lately. Recently a great number of sites has been showing me an error regarding an embedded site and blocking me completely from it's content.

I've read on many forums and searched the brower console and it seems like firefox is having an issue with X-Frame-Options being set to "sameorigin". It gives me a lot of trouble and is blocking me out of a lot of media.

I love security measures Mozilla has implemented over the years but I do not feel comfortable when software I use won't let me toggle less important safety features On/Off or at least whitelist sites I know are safe.

Speaking bluntly, it's ridiculous that I have to try 10 different websites with the content I want to watch, just to find one that has a built-in player, instead of an embedded one. It also seems to be spotty with what it blocks and what it doesn't block as some sites with an embedded player work with no issues.

I couldn't find any way to turn it off that won't possibly affect other security measures, or won't require me to go into brower console every time I want to access media.

Please instruct me how to fix this issue and consider making changes regarding it.

Thank you in advance :)

Every time I launch a fresh copy of Firefox all my saved accounts ect are gone. Now I know they aren't gone because the profiles.json files is still there. What has happened is firefox has taken the cookies.sqlite and added .bak on the end.

I've reinstalled firefox, tripple checked my settings and clearing stored data on browser close. What am I missing to stop firefox from doing this?

See attached screenshot. It just randomly happens from time to time, and I can't figure out what's causing it. I've used both Chrome and Firefox with the same results. Help!

i can't get firefox.com/pair to show on my desktop.

I have just reinstalled MS Word on both PC & phone, (as something has gone wrong with my somewhat elderly PC). My phone (Samsung) says to connect mobile device with my Mozilla account, then I need to open Firefox on the PC, visit Firefox.com/pair, and follow the instructions to connect the mobile device.

I can't find firefox.com/pair on the PC.

I've recently done a clean reinstall of Windows 11 and have noticed that, only for firefox (134.0.2, build ID 20250120135430), a few videos playback without any audio, yet the same videos play with audio when using edge as a comparison. Most (if not all) of these videos did play with audio in firefox prior to this reinstall.

Firstly, I'm pretty sure this is not a windows sound mixer issue since many videos on the same page and tab play back with audio just fine in firefox. The same goes for it not relating to the firefox setting 'Speaker selection', under (burger) > settings > privacy & security > Permissions because videos of different formats (or using different players) on the same page play back audio fine. The tab is not muted. Again, some videos on the same browser tab play audio fine; some of a particular format or player only play the video, while missing the audio (and where Edge plays the same video with audio).

Another common and potentially relevant issue I've seen is that, this being a 'Windows 11 N" install, it was initially missing the settings > system > optional features > Media feature pack, but that is now something I've successfully added. I should add that windows did report problems when I initially tried to add the media feature pack but, after a very long delay, it eventually appeared to succeed when I ran a couple of DISM incantations that I think ended with - "dism /online /add-capability /capabilityname:Media.MediaFeaturePack~~~~0.0.1.0"

I have the 'Play DRM-controlled content' setting enabled.

Comparing the firefox vs edge video playback on this video test page - https://tools.woolyss.com/html5-audio-video-tester/ I get the following results (don't know how to get it formatted/aligned correctly, sorry) -

                           FF vid    FF audio    Edge vid    Edge audio
av1-opus-sita.webm          Works     Works       Works       Works
vp9-vorbis-spring.webm      Works     Works       Works       Works
vp8-vorbis-sintel.webm      Works     Works       Works       Works
avc-aac-nerdist-friends.mp4 Works     MISSING     Works       Works
avc-aac-big-buck-bunny.m4v  Works     MISSING     Works       Works
avc-mp3-sita.mov            Works     Works       Works       Works

And perhaps also relevant is that there's also a difference in the audio-only samples further down the table on the same page -

                   FF audio   Edge audio
audio-sample.mp3    Works      Works
audio-sample.weba   Works      Works
audio-sample.ogg    Works      Works
audio-sample.opus   Works      Works
audio-sample.flac   Works      Works
audio-sample.wav    Works      Works
audio-sample.m4a    FAILS      Works
ac192.mp3           Works      Works
spoonradio-hd.aac   FAILS      Works
audio.opus          Works      Works

Also, every 'v.redd.it' / reddit-video-player video plays the video fine but has no sound when using firefox but plays both sound and video fine with Edge. Here's one for example - https://old.reddit.com/r/funny/comments/1i7y1nr/rock_paper_scissors/

I've seen lots of similar (but not identical) issues on firefox video with no audio problems with suggestions a few things to try. In addition to what I've already mentioned above, I've tried the following without success -

- Restarting windows - Restarting firefox - Restarting firefox with addons/extensions disabled - 'about:support' > Refresh firefox - 'about:support' > Clear startup cache - (hamburger) > more tools > task manager > (click the little profile icon for the page playing the video) - I've checked the settings suggested here: https://support.mozilla.org/en-US/kb/fix-common-audio-and-video-issues#w_check-some-firefox-settings

I realise it may be possible to side-step this problem by flailing around with more drastic work-arounds like trying a clean re-install of windows or a full uninstall and clean of firefox, but that doesn't really help figure out the problem, which leaves the possiblity it could easily happen again to me or others when it might be something that can be more properly fixed or guarded against in firefox itself, so I hope someone can suggest what might be done to home in on identifying the cause of the problem and so learn whether a more precise fix can be employed.

Firefox opens only to a blank page and does not function what so ever. I've tried several times refreshing it, however, nothing helps. Point of interest is Microsoft Edge won't open either and I am currently using Opera which is working fine. Any suggestions would be appreciated.

In the last couple weeks i've encountered an issue where video footage, but not the audio or the video progress itself, will freeze if I tab out of Firefox and into a game window.

Here's a video showing the issue

Like shown in the video, It only seems to affect Firefox and not other browsers, and it only happens when I switch to a game window, not other tabs. It should also be noted that although the video only shows YouTube footage, this issue affects every player I've tested it on.

I've tried this both with and without extensions enabled, as well as just about every video player related config in the about:config page, and with both hardware acceleration on and off, still with no luck resolving the problem.

If anyone has had a similar issue and managed to fix it, help doing so for myself would be much appreciated.

I’m getting “'Gah. Your tab just crashed’” basically every other website I open (including this one). I don’t notice anything in common with the websites I’m visiting and it’s happening in the troubleshooting/safe mode as well. I’m using the most recent version of Firefox and am running MacOS 12.6.

I downloaded a PDF and used Firefox to view the file. I'm trying to find key words in the PDF and I always get phrase not found. As a test I inputted a word I found in the document but find in page stated phrase not found. What am I doing wrong? I remember that I have used that feature in the past and it worked.

Problem: when I make new firefox window(launch .exe, drag a tab out, shift+left click link...), there is tiny gap between screen edge and new firefox window. (fullscreen works ok)

Expected behavior: no gap between screen border and new firefox window

Image 1: firefox window snapped to right. Image 2: new firefox window after minimize right-snapped window. Image 3: firefox window across left screen border. Image 4: new firefox window after minimize across-left-border window.

Tried: edit&delete xulstore.json, reset firefox, uninstall and reinstall firefox. still same issue

Hello, Thanks in advance for your help. I am having trouble logging into "trusted" web sites with Firefox and every update seems to add to my problem. By "trusted" web sites I mean sites like Charles Schwab, Spectrum and iCloud as well as my city's water department and my local hospital's portal. It doesn't matter whether I use "normal" Firefox or its privacy mode or safe mode-the problem persists. I am running Firefox version 134.0.2 but the problem goes back several months. I have Windows 10 and use Malwarebytes Browser Guard. The only other add on I use is Print Friendly & PDF. It doesn't matter whether these addons are running or not. The problem seems to involve either a loop, blank fields or very odd error messages. Some examples are below:

iCloud allows me to get to the point where it asks me to supply the 6 digit verification code. I enter the code and the site loads. Approximately 2 seconds later, before I can navigate to anything in iCloud, I am taken back to the log in screen to start over. The loops repeat as often as I want to try. Clearing cache and history does nothing. Since there is nothing abnormal (no error message or blank fields) I have not included a screen shot.

Spectrum allows me to enter my credentials waits a while and then gives me an odd error message about Feature Unavailable and suggests that I try logging in from home. I might add that all of these problems occur while I AM at home. Screen shot attached.

Charles Schwab allows me to get to the log in screen but the screen is unusable. There is a message that the session has timed out and I need to log in. The log in sections of the screen are blank which leads me to believe that the page is not loading all the way but that is a guess. Screen shot is attached.

I can log into all these pages with Edge (which I dislike using) with no problems at all.

I have Firefox set to automatically delete cookies and site data when closed. Privacy is set to Standard.

I would really appreciate any help that you can give me. Please note that the screen shots are BMP files that I had to rename to GIF files to get them to upload.

Thanks again,

Charley

For a few months, and I've seen this happen randomly over the last 5-10 years - pressing enter doesn't work, and sometimes dragging a new link into the empty tab space next to the tabs creates a new tab with the URL in the URL box, but not 'opened'

Does firefox have some issue with loading a web page?

I use ublock origin on default settings, and violent-monkey and stylish for scripting.. but would that disable searching google from a new tab?

Apparently I sync'd from the wrong direction (machine) and my old MBP now has only one default container now. The dozen or so containers I had have disappeared. You need to be clearer in your directions and define the use cases. In my case I want to port over FF from an old MAC to a new MAC. This would include my settings, configuration history, folders, bookmarks, extensions, homepage, and my containers to a new MBP - so it looked like the old one. Eek I thought it would be smarter and see that the new MBP was a newer version and had no configuration. Now I have blown away the containers and have to remake them. I also notice now that my settings - home page, history are not the same yet so I will have to look into what is going on there.

I am disappointed with the way this is going. Your initial master sync should be clear, there is no way to see if it is done or running or completed the initial sync. Honestly, the master sync should be treated differently from intermittent syncs anyway. Now the containers on my old MBP are has changed to the original 5 or so default containers, all of my containers are definitely gone! I logged out of mozilla, since it is apparently breaking my good version of FF.

Please clear up the documentation and include the use case of porting to a new machine to include Containers.