Firefox Community Forum

Firefox prompted me to update, I hit download, my entire PC froze, I restarted the computer, when I opened firefox again and hit "restore session" it restored a session that I had opened months ago. When I checked my history, everything after that older session had been deleted. All of my history from the past few months has been deleted. I tried a few different solutions from trying to research the problem, nothing so far has worked. The only thing I have found is a session restore error saying "could not decompress file", but I could not find the file it was attempting to decompress. This is the error message I found.

1785894397652 SessionStore ERROR NotReadableError when reading session file: recovery: NotReadableError: Could not read `C:\Users\ansen\AppData\Roaming\Mozilla\Firefox\Profiles\xpnhovd6.default-release\sessionstore-backups\recovery.jsonlz4': could not decompress file: invalid LZ4 header: wrong magic number: `00 00 00 00 00 00 00 00 00 00 00 00' (NS_ERROR_FILE_CORRUPTED) No traceback available 1785894397756 SessionStore ERROR NotReadableError when reading session file: recoveryBackup: NotReadableError: Could not read `C:\Users\ansen\AppData\Roaming\Mozilla\Firefox\Profiles\xpnhovd6.default-release\sessionstore-backups\recovery.baklz4': could not decompress file: invalid LZ4 header: wrong magic number: `00 00 00 00 00 00 00 00 00 00 00 00' (NS_ERROR_FILE_CORRUPTED) No traceback available

Any help is greatly appreciated. I'm one of those people that tends to have way too many tabs open at once due to poor memory, and losing months of tabs and progress is a huge setback. I'm very desperate to get the history and tabs back.

From Firefox, I have launched Earthlink Web Mail. When reading an email, scrolling doesn't work. It worked yesterday from firefox. It works today on Edge. It works today on my Android phone.

Now when I click on something in Firefox, for example a Facebook post, it opens in full-screen mode, not just in the selected window size. When the new window opens in full screen, it covers other stuff already on the desktop. It's f'ing annoying. How do I choose to have new windows open at the existing window size?

I am using the latest 155.0 build of Firefox on Windows

Edition Windows 11 Pro Version 25H2 Installed on 21-08-2026 OS build 26200.9278 Experience Windows Feature Experience Pack 1000.26100.360.0

Recently, probably around a few weeks ago, I have found that i am no longer able to reorder tabs using the mouse left click and drag to reorder.

The mouse is working fine and I am able to do the same reorder on the Chrome browser however it doesnt work on Firefox anymore.

The only way to reorder tabs is to use the popup menu and select Move Tab.

Kindly fix

Regards Sanjay

Issue persists on Incognito Mode and it goes away if I use different browser.

Since 2 days issue like this happened and it is retroactive meaning all previous conversations are also blank, all replies of chatgpt are blank except replies with image generation, those are fine.

Before you recommend me to do something please keep in mind that Incognito itself does not help.

I am able to share that chat, paste it in my firefox and page is blank. https://chatgpt.com/s/t_69f4b354cc188191a7959c2d443fed9d

I can use this adress on different browser and it works fine

After today (Sep. 2, 2026)'s update, I noticed that the the plus "+" button for new tab is canceled. Instead, I have to now click right on the work function and click "New Tab" for a new tab. This revision is quite counter-intuitive. Could you please add back the plus "+" button for new tab in the next update?

Thank you very much.

How do I get my apps, like Duolingo, Facebook etc. back on my Firefox page? I just perhaps, made a mistake, and downloaded the new Mozilla/Firefox page and now I don't see my apps that I use everyday. Help!

It appears the new update in Firefox has glitched my settings. Everytime I try to disable it on the homepage, and I reload it, it just turns itself back on. Settings not on the homepage does not help either. Nothing appears to work, although it has been working for many years until today.

Hi folks!

My Firefox just updated and I'm now receiving the recommended stories (along with the widgets and recent activity.) when I open a New Tab. I was able to disable the widgets and activity and I see the place where I can turn off the Stories, but they are not going away.

In the "Customize" menu accessible via the pencil icon on the New Tab page, toggling Stories off does not make them go away; reloading the page, the toggle is re-enabled.

In the general Settings menu, accessible via the hamburger menu and under "Home and startup," I have Stories ("Exceptional content curated by the Firefox family") toggled off. The toggle does not reset, but the stories still display.

How can I fix this? Thank you all very much in advance.

I found a parameter to open Firefox with a dialog to select the profile (-P) But, I'm looking for a parameter to open direcly Firefox with a named profile.

Thanks

Hello,

My Win 11 Home (ver 25H2, OS build 26200.9168) Dell laptop runs Firefox v. 155.0 and doesn't load costco.ca however my iPhone 15 Pro Max running Firefox v. 154.1 does. The laptop's browser initially loads the costco.ca landing page (for 1 second) then displays a white screen with this message: "Application error: a client-side exception has occurred (see the browser console for more information)."

What can I do to enable Firefox to load Costco.ca on my laptop?

Thanks,

Steve

When I started up Windows 11 on my new laptop, I had to connect to the web via Edge to be able to install Firefox. I foolishly went on to install Firefox via Microsoft Store. I have now installed Firefox from the Mozilla website via the Microsoft Store version, but I cannot uninstall the Microsoft Store version. I don't have access to the folder where it is installed even though I log on as an administrator.

I use GiveAsYouLive to raise funds for charity when shopping online. To ensure it works what settings should I have in Firefox to allow the shop site to interact with my browser? Please explain in simple terms as I'm not a techie !

You say, "Some essential Mozilla services are excluded from VPN routing to ensure sign-in, VPN reconnection, and screens needed to sign in for public Wi-Fi work properly. All other browsing activity in Firefox remains protected when the VPN is on."

How then am I protected in any kind of secure way?

All it would take is the Mozilla services using my public IP to lose my browsing protection. How are those connections secured to protect my identity from being exposed once the VPN is enabled and even after the VPN is enabled?

If the public IP can be discovered at sign-in, re-connections, and public Wi-Fi connections before the VPN is enabled, then that same public IP can be traced through internal logs to uncover all the VPN activity done after sign-in, re-connections, and public Wi-Fi access. So, how exactly can I trust the VPN protects my activity at all?

I'm just curious how you setup any protection prior to the VPN being enabled? I'm a former IT Network Specialist I had my CISCO CCNA certificate (Worked in school districts who wouldn't pay for additional certificates so I did all the study work and practice testing up to the CCNP certification just could never afford to take any of the exams beyond the CCNA). So, when I see these additional things like your 50 GB of free browser VPN and read how it works I get curious about the actual protections being provided. Are the people more vulnerable than they may be led to believe?