Firefox Community Forum

Firefox lived on my computer for three days. On May 30th I installed the latest version of Firefox Developer Edition. Today when I launched my browser I saw a page notifying me that my version of Firefox is the latest [152.0b6 (64-bit)]. All installed extensions disappeared, the connected profile was deleted, the .mozilla/firefox directory contained only the newly created profile... No history, no bookmarks... No crash reports...

What happened? Now I'm afraid to sync the browser with my phone, in case it clears all my passwords.

On 2026-04-15 from about 10:00 CDT on, I have not been able to update Nightly nor Firefox Developer Edition (Aurora). Both of them notify me that there is an update available, and when I click on Help -> About Firefox I get the usual panel that gives me the update ID to click on. Clicking on it tells me it's Downloading Update -- 0 bytes, and it never flashes the expected size of the update, never shows progress, and never completes. It seems to be acting as if the update server is out of commission.

I want to upload the current version of Firefox. However, the system Administrator (who is me) will mnot allow me to do so. How do I change settings to allow for the upload.

I've been prompted to update Firefox. Multiple times I have downloaded the latest version, deleted the existing one, and installed the latest one. The next day I get the same prompt that I'm in need of an update.

Firefox no longer allows me to delay updates. Twice in 2 weeks, all of my cookies were blown away during the Firefox installations of 150.0.0 and 150.0.1. I have 8 Google Email Accounts - all forgotten and no longer accessible. The same is true for Yahoo finance; banks; and the myriad of other sites I use daily. I checked this morning, and all sites visited before 150.0.1 was installed (against my will), have zero cookies. Only sites visited after the installation of 150.0.1 have cookies. This is a tiny subset of cookies I rely on for daily use.

This makes Firefox useless. I can't spend hours trying to recover from untested software every two weeks. Until this is fixed, I have to switch to Chrome or Edge.

I'm running Windows 11 Pro..

Hello, I have Windows 7 and I use Firefox ESR as my browser. It has work correctly for years now, but since a couple of days it has problems with downloading the latest updates. It asks me download the update but as I go into the settings page, the download is stuck at 0 kB. I also get a message box that FF is not able to download the update and it sends me to a Mozilla Firefox ESR download page and when I want to download the ESR version, FF cannot open the page with the installation file. Also many other links on the Mozilla page do not open or do not open correctly. Also it doesn't open this support page, I am writing this messages through my phone. Also it doesn't open the website bol.com. So what can I do. I have already tried clearing the cache and cookies. It doesn't help. I hope you can help.

After I upgraded Firefox on my Dell desktop the left side of my keyboard stopped working so. I bought another keyboard when I upgraded again it stopped working. Talk about frustration

Hi there, Im on a windows 10(ish) and yesterday got this problem after the auto update to firefox 133.0.3 - Update is not working. error window says platform version 133.0.3 is not compatible with minVersion >= 133.0... how can I fix this?

I've seen that there was a similar issue back in October with a previous version. Tried to follow instructions and reinstaled firefox from mozilla. But the problem is still there. Restarted after reinstalling and still getting the same error message. ((( Please help )))

Hallo zusammen,

ich kann meinen Firefox nicht mehr aufrufen, weil er wohl nicht kompatibel mit 133 ist. Es wird empfohlen zu deinstallieren und neu zu installieren. Aber dann sind meine Favoriten, Lesezeichen und Passwörter weg. Ich kann sie nicht sichern, weil ich keinen Zugriff auf die alte Version habe. Wie löse ich das Problem?

Viele Grüße Annette

Hello everyone,

I can no longer access my Firefox because it is probably not compatible with 133 (see screenshot). It is recommended to uninstall and reinstall. But then my favorites, bookmarks and passwords are gone. I can't save them because I don't have access to the old version. How do I solve the problem?

Best regards Annette

The Firefox update I was prompted to initiate on May 12 resulted in a compatibility issue message. Following Firebox Help recommendations, I re-installed my Firefox. Now I see that my downloads folder has a long string of unfamiliar files, and I need assurance that these are not remnants of malicious activity. All files have names like i-33639-002-XX.jpg and are dated the same time (5/12/2026, 4:07 PM). Each file shows as “0 KB” in size. All are listed as “JPG File”. Has this happened to other Firefox users?

Hello,

When I attempt to open Firefox, I am getting a pop-up screen saying:

135.0.1 not compatible with min version >= 135.0 max version <=135.0

Also, I am being advised to reinstall Firefox. Do I need to uninstall Firefox first?

Windows10, Dell Laptop

Thank you,

Petrik

Mozilla support articles frequently state that Firefox does not use popups for browser updates. However, I periodically receive popups from the toolbar stating that Firefox couldn't update automatically. The attached picture is an example from the web but looks just like the popups I receive. The issue typically either resolves itself or I download from the Firefox website and reinstall. In a rush/moment of weakness, I recently clicked the link in the popup. It took me directly to the Firefox website where I regrettably downloaded and updated the browser. I've since run multiple Norton and Malwarebytes scans, which have found no issues. It may be a difference in the definition of popups (from the toolbar vs within a browser page)... Is this a legitimate update message from Firefox? If it is not, are there any other steps I should take (e.g., reinstall Firefox)? I appreciate your help!