Firefox Support Forum

As the title says, I cannot get MP4 files to play in Firefox, which renders several websites unusable. These sites work in Edge just fine, but I cannot get them to work in my preferred browser. Everything is up to date, and I have all the codecs I could ever need installed, as well as the Windows N Media Feature Pack. The browser has been tested several times in troubleshooting mode, and I've even gone as far as running Windows in safe mode with networking to try to isolate the issue. I cannot get it to work at all. This is the 2nd device I've had this issue on, and it's driving me up a wall.

Any help or advice would be greatly appreciated.

Firefox 103.0 (64-bit) Windows 10 Pro N 21H2 19044.1865

This morning I re-installed an update to Zoom (on Linux - ElementaryOS / Ubuntu 18.04). Since installing, I've not been able to follow links from Firefox to Zoom (zoommtg links don't open the app). However, they still work from Epiphany.

The slight confounding factor is that I realised that I've been updated to FF 104 overnight, so that might be an issue.

I've been looking at network.protocol-handler.... settings in about:config, based on this article: https://superuser.com/questions/1343020/how-to-configure-firefox-open-zoom-urls-using-zoom-application#1351073

I've also been looking at xdg-settings (based on this article) https://www.reddit.com/r/kde/comments/i83m8i/zoom_desktop_client_isnt_launching_from_browser/ which suggests the problems might be to do with xdg-settings calling /usr/share/applications/zoom.desktop when the available file is /usr/share/applications/Zoom.desktop However, I have not been able to alter the xdg-settings parameter - when I try: $ xdg-settings set default-url-scheme-handler zoommtg zoom.desktop it does not change the setting - it remains as Zoom.desktop

I should mention that the version of FF I'm running is delivered as a snap - but this was not a problem before 104 / my latest Zoom installation. Also, this version of FF has no problem opening up MS Teams meetings or Slack groups. handlers.json includes : ... "slack":{"action":4},"snap":{"action":4},"zoommtg":{"action":4},"msteams":{"action":4}}, .... so I am thinking the problem must lie somewhee else.

Any suggestions would be gratefully received.

thanks Andy

Accidentally added a misspelling to the Firefox dictionary. Thought it would be easy to locate and edit the dictionary.

Enabled 'show hidden files.'

On XYplorer, and Windows File Explorer can find not a single trace of 'persdict.dat' in my profiles folder.

It would be really helpful if you could advise what the next step would be. Thanks.

Went to update to 105.0.1 on a windows 8.1 machine. Update failed, removed previous version and now will not even reinstall running the installer. Installer returns setup.exe Application error. unable to start correctly.

I just updated to FF 111.0. After restarting FF comes up but then nothing. After a bit of I got the option to force close it. I tried opening a Private Browser and that worked fine so I figured it was one of my add-ons. However after closing the Private Browser and trying opening normally again it worked just fine. Disable all of my add-ons and for the same issue.

Renamed my AppData/Roaming/Mozilla folder and starting as normal worked fine. What a giant pain in the <bleep> trying to set everything back up.

Performed some more science and noticed this. After setting my Mozilla folder back, starting FF, and looking at the TaskManager, There would be 3 processes, one of those after a bit of time would show in red as Not Responding (or words to that effect). Clicking the window a few times to get the force close dialog again. Trying to open FF again, it opened just fine.

So I'm tempted to blame something in the update that is causing this. Yes, I could just start with a fresh Mozilla folder and reinstall all of my add-ons and blah blah blah, but whose to say that after setting everything back up the way I had it the problem won't come back.

I have thought about rolling back to FF 110.0.1, and suppressing the update check.

OS: Windows 10 64-bit Firefox: 111.0 64-bit

Hello.

Typing anything in URL (address) bar causes my CPU spike to 15-20% shown in Windows Task Manager, and up to 80% shown in Firefox Task Manager. I have 8 core / 16 threads CPU running at 4.0 GHz, so typing text in browser taking 15-20% of that is rather bizarre to me. OS: Windows 10 What I tried: - disabling Firefox Accessibility Service - hardware acceleration on/off - troubleshooting mode

Don't have same issue in other browsers (Chrome, Opera) Any ideas what else that might be?

I've run into a troublesome error with Firefox for probably eight months now, so I have not been using the browser. Whenever I attempt to install ANY add-on from the Firefox add-ons page, I get the message "[Add-on name] could not be installed because Firefox could not modify the needed file". Furthermore, attempting to download the add-on file manually (should it be available on a github page or the like) leads to the same message or a notification that the download failed.

As a matter of fact, downloading almost any kind of file on Firefox inevitably fails. The exact notification is shown in the upper-right corner of the browser window, where downloads are shown, and beneath the file in question is an indicator that says "Failed". Everything from .png to .zip to .exe appears in the downloads queue for a second, then fails.

I have tried every solution the Firefox add-on troubleshooting page has suggested, including solutions suggested in other threads, such as deleting/creating new profiles. I have also attempted to completely reinstall Firefox on multiple occasions, as well as the refresh Firefox option.

To recount, the following troubleshoot solutions did not work:

--Everything on the Firefox add-on troubleshooting page --Restart Firefox --Refresh Firefox --Create new Firefox profile and attempt to install add-ons from there --Delete and renew the extensions* files from the profile root folder --Modifying the xpinstall.signatures.required in about:config (true or false, doesn't matter) --Modifying the extensions.alwaysUnpack in about:config (again, true or false, doesn't matter) --Double-checking allow list and permissions on local firewall and antivirus software (the app is protected, add-ons are allowed) --Disabling antivirus software --Running Firefox as Administrator --Reinstall Firefox --Restarting PC

If I want to download a file or add an extension, I need to switch to a different browser such as a chromium-based one or Microsoft Edge to download the file. In the case of add-ons, I switch browsers, download the file, and select the "install add-on from file" option under "manage extensions" in about:addons.

One final thing. It seems that sometimes streaming sites won't work on Firefox (even with ad-blocker disabled or the site allowed through the ad-blocker), and sometimes video won't properly load either. These things work fine on other browsers.

I really like Firefox as a browser and enjoy the privacy it provides built-in. I didn't have any of these issues up until last year and I was forced to switch over. I would really appreciate any help with this.

Today, my daughter received a notification that the Dragon Professional Web Extension has been disabled (see attached image). This was done because the extension supposedly executes remote code and collects user data.

My daughter, a mathematics professor, has very limited use of her hands. She is dependent upon Dragon to do her job. This is not something she just likes - she has a disability and she NEEDS it. Disabling this extension will make her job significantly more difficult, and there are capabilities that the extension provides that she may not be able to duplicate with workarounds.

PLEASE, make the extension useable again. This is an accessibility issue for disabled people - it's not just a fun addition to the browser. If necessary, add some sort of acknowledgement checkbox so that she can acknowledge that she is taking some risks in using it.

One other thing. Disabling this extension with no advance warning was a disservice to all disabled people who depend on it. Had this occurred in the middle of a semester, the effect could have been catastrophic. As it is, she may need to spend the rest of the summer trying to figure out how to do her job without it. You have really, really done an extreme disservice here.