I-Firefox Community Forum

Since I upgraded from FF128-esr to FF140-esr I always get the "Firefox is being updated by another instance" This is really driving me crazy, as I checked / did / .... everything (and even more) I found on the internet related to that.

Nothing helps !

Creating and using a new default profile didn't help

Finally I ended up uninstalling FF completely (making sure no -zero- leftovers remained in ProgramFiles, AppData a.s.o.), and reinstalled FF140.7.0-esr freshly. After installation I started FF immediately with the created default profile (only existing one) --> SAME THING : "Firefox is being updated by another instance"

And this is really a FF140 thing, when I go back to FF128, on the same computer, same profiles, ...., the problem is gone.

I would like to know in detail what checks are really done by FF to decide to give that "Firefox is being updated by another instance"

I'm running Firefox on Win10 with no options to upgrade to 11. Since the latest firefox update installed, I'm getting a screen that says "Oops, something's wrong," and then I'm kicked out of gmail. A screen asks about sending a report to Firefox, which I check OK for. Today this is happening about every minute to 30 seconds . What needs to happen?

I see many complaints about this new version v 149 for the Mac. The most outrageous one is that you can no longer drag links from a browser page (try BBC) to an email or a doc. You have to copy the link then it won't turn blue and only when received will it show up as a link. Like many others after 30 years use preferred over Safari and others I am seriously losing patience with Firefox. On the very day you announce split screen for Ff windows - you disable a vital feature that has worked for years causing me to waste so far 60 minutes of my hard pressed work time. Maybe this will be corrected in the next upgrade. But I am now intending to avoid all Firefox upgrades for 6 months after being offered. I doubt anyone on this forum will come back on this but my set-up is Mac OS Monterey - and Firefox v 148 worked perfectly before today. I hesitate to try and install the previous version because I am not used to doing such tech moves. Perhaps someone in the Mozilla head office congratulating themselves on the marvellous new upgrade will come across this but I doubt it

I lost all bookmarks on or about June 29, 2026 after doing a Firefox update that asked me to create a profile when I'd never had one before. I have not been able to recover them.

For some reason firefox uninstalled on my computer, I genuinely do not know why. When reinstalling it, I have an old save from my backup of that morning (I have it setup that way). However, I do not remember this password whatsoever and I am freaking out a little bit since I have information on there and I am just trying to get it restored onto my account.

Any help would be appreciated.

Recently updated from 148 to 152 and it has added these dropdowns to both the address and search bars (see below screenshot) that require additional clicks to get past that I do not want. Ideally I would not have these (or would maybe have the search drop down appear AFTER the search field itself).

Behavior I don't want: searches to appear in address bar. Behavior I don't want: search drop down to appear in address bar at all. I require a clear delineation in my workflow for things I have actually visited (addresses) and things I am planning to visit (searches). Behavior I don't want: search drop down to appear in search bar between address bar and search bar (one tab click should take me from address bar to search bar - now it takes two tab clicks because of this drop down).

Resolutions I have tried: Going to "Settings > Search Engine Suggestions" and completely unclicking "show search suggestions". Going to "about:config" and setting the following fields to false: browser.urlbar.suggest.searches keyword.enabled browser.fixup.alternate.enabled

None of these actually remove the dropdown entirely from either the address bar or search bar.

How do I remove these drop downs aside from downgrading back to 148?

Has Firefox's interface gotten smaller? The tabs and search bar are much more difficult for me to read now, and the symbols are extra tiny. I cannot figure out how to enlarge them, since zooming in only affects individual web pages. I tried looking in Settings, specifically the Accessibility section, but I cannot find a way to enlarge this part of the web browser. Help!

Hi,

After the last two updates, the **Pseudo-elements** tab in the Browser Console can no longer be closed once it has been opened, and vice versa.

Please see the video below demonstrating the issue:

https://www.awesomescreenshot.com/video/54512049?key=4422b692b5131ae71def568f54d6f82d

Thanks.

Subject: Firefox Sync appears to have erased all bookmarks after setting up a new Windows installation

Hello Mozilla Support,

I believe I have encountered a Firefox Sync issue that resulted in the loss of my entire bookmarks collection.

Here is exactly what happened:

I have been using Firefox Sync for several years without any issues. This was not my first Windows reinstallation. I have restored Firefox through Sync multiple times before. Firefox Sync had always synchronized bookmarks, passwords, history, extensions and open tabs correctly across my Windows PC and Android phone. I had approximately 350 bookmarks, organized into folders. Timeline Yesterday I performed a clean installation of Windows 11. I installed Firefox 152.0.5 (64-bit). I signed into my existing Firefox Account. I did not immediately enable Sync, so nothing was synchronized at that point. Today I enabled Sync and waited for the synchronization to complete. Passwords synchronized successfully. Browsing history synchronized successfully (it took a little longer). Extensions were restored successfully. Bookmarks never appeared.

Immediately after noticing this, I checked Firefox on my Android phone.

At first, one of the bookmark folders still showed that it contained more than 300 items (I saw the item count), but when I opened the folder it was completely empty. After synchronization finished, all bookmarks disappeared from both devices.

Additional information Browsing history is still present. Saved passwords are still present. Extensions are still present. Open tabs synchronization continues to work. Bookmark synchronization is enabled. I am signed into the correct Firefox Account. The second local Firefox profile is empty. The automatic bookmark backup now contains only the current state (7 items), indicating that the original backup has already been overwritten. The current profile contains both places.sqlite and places.sqlite-wal. The only Sync error log is related to a temporary DNS lookup failure (NS_ERROR_UNKNOWN_HOST) and contains no bookmark synchronization errors.

Because history, passwords and extensions synchronized correctly, this does not appear to be an account or authentication problem.

What concerns me most is that I briefly saw the bookmark folder still reporting over 300 items on Android before it became empty. This makes me suspect that something went wrong during bookmark synchronization rather than the bookmarks simply never existing on the server.

Could you please advise:

Is there any server-side recovery or investigation that can be performed for Firefox Sync bookmark data? Are there any diagnostic logs that I can provide? Is this a known issue with Firefox Sync after connecting a newly installed device?

I would greatly appreciate any assistance, as this bookmark collection had been accumulated over many years.

I have a Sync error log available: error-sync-1783454370913.txt

It only contains a DNS error related to tabs synchronization: NS_ERROR_UNKNOWN_HOST

There are no bookmark-related errors in the log.

Thank you.

The new "Copy Link to Highlight" button shifted the "search with" option down, which I use regularly.

I'm not entirely sure what the new option does, but I would like to either disable it or shift it further down out of the way

I have to reload history, bookmarks, passwords each 3 - 4 days, when Firefox refreshes the software. It was not happening before, just in the last two moths. How can I fix it?

Hello, I have noticed that using firefox without closing the browser for a while causes the memory to keep rising. It looks like it has a memory leak. After 3 days of watching YouTube I was using 4GB of memory. It was causing Slow Downs.

I have included 2 images with what is actually running and I have 2 Tabs in Standard Browser of Google and this Tab for this report then a YouTube dedicated browser using split tab.

Hello I just filled out a pdf and the font or writing came out blue I want it in black is there some where in Firefox i can get it in black w font or writing please Advise thank you

On my personal computer, I have a Profile for work and I was logged in via a Mozilla account using my work email address

I've recently set up a similar thing on my work computer. Signed in using Mozilla account. I have since noticed that on my personal computer it says "Account disconnected."

I'd like to sign in again and sync them so that I always see the same settings, shortcuts, open tabs etc on both computers. But if I sign in right now, will I lose the customizations I've made on the work computer? Which computer will it consider to be the "source" of the newly synced information?

hi, in my older laptop i have no problem downloading pdf files. Canva or webpages that open as pdf file. But in my new laptop i have idm downloader installed. download helper is also installed yet pdf file is not downloading. In canva it is not downloading at all. in case of pdf webpage the page is staying white with no action. What should i do. I searched web about this but never got an answer. even now i don't know if i explained the problem in a way you could understand

okay firefox crashed ive been using it for 3 years on steam os . it ussually crashes normally if that makes sense but this time it went poof . it saved one window containing all my browse history bookmarks dverything , i succsessfully transfered the crashed windows to kate windows containing 2.1 megabytes of extremely important data - riht before it crashed again. i am extremely frustrated , it erased all knowledge of me ever being on firefox erasing history bookmarks log ins everything. it is extremely imperative that i get these windows back . ive been battling with ai to fix the problem my last resort is you guys the ones who made firefox. id like to think you guys built something for this exact occasion . please help, you are my last resort and i would be overjoyed if you can help , thank you ,

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Before facebook using reCAPTCHA I can easily logo in my Facebook and Instagram account, but now I always failed to pass the reCAPTCHA， I report this to Meta no good reply. Only today I did the reCAPTCHA and then got a reminder that facebook cannot detect the reCAPTCHA. I still cannot logo on to my facebook and instagram account due to reCAPTCHA. How can I solve this problem. Thx