Komunitné fórum Firefox

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?

All of my history except of today's has disappeared. I did not erase my history, and really need it back. I did try to remove a couple of sites from my Most Visited, as Firefox was saving all sorts of sites I don't really visit often. In addition, I am being asked to sign in with my password at every site I go to where as before I was automatically allowed to enter, as all my passwords are saved. What happened - and how can I get back to normal?

Contributor note: bookmarks are also missing (/questions/1578816).

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 wish to add an exception to an address which I host locally. I've explored many options which didn't work such as: Adding HTTPS-Only Exception Disabling certain security features

See the subject. I've been seeing delays in launching for several months. I've run several windows defender malware checks (full and the one where it runs outside of anything brought up). I've reset firefox. I did all this also because I was seeing random ads from a news site from what they were trying to get me to do was install macafee (but it's malware). While I'm not seeing those ads now and I'm suspicious they can from the news site vs. my browser, I'm very aware of anything trying to capture screen scrapes. I'm even considering changing all my passwords as I'm not sure if anything was captured. This morning, firefox upon launch took a long time. Then it said installing updates. My desktop flashed and firefox launched. I have not installed anything or any addons, extensions, etc. So either this was firefox doing an update it needed or it's something else. I'm on windows 10.

I have been told to disable my ad-blocker by some commercial web sites and I understand that. But I am also not seeing charts and other non-ad items on web sites such as this one: https://www.medscape.com/viewarticle/alcohols-health-myth-over-how-tell-patients-2026a1000map?ecd=wnl_tp10_daily_260703_MSCPEDIT_etid8475291&uac=146695DK&impID=8475291. I don't want to change my default browser but this is a recent development that seems to be impairing my viewing of pertinent items placed on legitimate web sites. Could you please tell me how to adjust my browser settings to stop this from happening? Thank you! Best regards, Bill Strike

I used to ignore these, but today I clicked through to see the extended code and it looks like the unauthorization was to log into my bank account at CHASE, which is concerning. I have a separate login, not an automatic one. I someone trying to get into my bank account?

Hi, I had to reinstall my windows where I thought my Firefox would sync up upon reinstallation. However, nothing would sync up and the best I could do myself was to import pretty out-of-date Chrome data. When I to my firefox account and scroll to connected services I see my last PC name with its firefox login. Is there any way to recover that data and import to my current device? I read you kept sync data as encrypted data on your Mozilla servers, so I hope that's a viable solution.

Linux Mint OS Firefox 152.0.4 Firefox does not recognize embedded iframes in local app page, anymore! I have a local docker app that can be accessed and functions properly,except for one thing The app has pages that have an iframe embedded within each page The iframe USED to display the correct iframe data for the page displayed NOW when an app page is accessed . everything on the page displays as normal and in the correct physical location,, EXCEPT for the iframe !!! The iframe contains a LOCAL url The page "looks" as if there is no iframe to be acessed ANY ideas??? Thanks, Anne

When will the Firefox developers fix the disappearing Bookmarks issue I reported approaching six years ago? I just had another occurrence today and it took quite a while to find the missing Bookmark. I do not remember IE 11 ever having this problem of recurring Favorites disappearing. I was told before that supposedly the reason is because I have a large Bookmarks file but as a researcher I need many Bookmarks. I guess the developers don't think disappearing Bookmarks is a problem that should be fixed!

So far, this year, the issue has occurred on: 1/6/2o26, 1/24/2026, 1/24/2026, 2/6/2026, 2/20?/2026, 4/10/2026, 5/17/2026, 5/21/2026, 6/16/2026, and today 7/6/2026.

Info about today's occurrence:

A Bookmarks folder titled Health which was located originally in: Bookmarks Menu | From Internet Explorer Was found located at: Bookmarks Menu | From Internet Explorer | Government | U.S. | Issues | !Misc (not in alphabetical order).

Please resolve without further delay.

Suite à une ré initialisation de W11 pour cause de bug de mon pc j'ai activer,sans savoir les conséquences qu'il en ressortir de cette validation, la géolocalisation sur mon navigateur firefox de mon pc en renseignant ma ville , action que je n'ai jamais faite auparavant Je me suis connecté sur mon compte FB et j'ai eu une fenêtre qui s'est affichée me disant que j'ai été géolocaliser sur un site avec un lien sur les animaux Trouvant cela bizarre j'ai cliqué ,non pas sur les 3 petits points verticaux mais sur la croix sensée être une annulation Suite à cette action plein de fenêtre se sont ouvert comme pour un piratage et avec message vocal comme quoi j'étais géolocalise sur site peu recommandable (Pédophile) j'ai éteint ,dans la seconde mon pc et je l'ai rallumé quelques instant après en me reconnectant sur mon compte FB avec tjrs cette fenêtre De là j'ai re éteint mon pc et suis aller porte une main courante hier le 6/07/26 à la gendarmerie la plus proche En rentrant de la gendarmerie et vérification FB plus de fenêtre indélicate , j'ai re initialiser mon pc avec changement de MP FB Je n'avais jamais eu de problème de ce genre sur FB et c'est aujourd'hui le 7/07/26 que j'ai constaté que FIREFOX me proposez de faire la géolocalisation de mon pc .Chose que je n'ai pas faite voilà les faits Question est-il dangereux de valider un choix proposé par FIRFOX Merci de votre aide Cdt Hubert Saule titulaire d'un compte MOZILLA Utilisateur de FIREFOX depuis plusieurs années

Help please, cannot open Firefox browser for Windows 10 Pro anymore, clicking icon advises my profile is missing. How to fix ? Ive also spotted a number of folders properties are showing the target as an A:\Users path rather than the expected C:\Users but the path is 'greyed out' and cannot be edited, help much appreciated

Hi I very often have problems playing videos on X/Twitter but not all of the time. Some videos just won't play but others do no problem. It's very frequent though and i have searched for a solution to this and can't find one.

i really need this colour switch pls. my firefox kept crashing with no explanation (maybe some extension i had, then deleted when the crashes began) so i had to reset the whole thing. now the appearance has changed. i had put back my background picture, witch was fine with me, but the text was black instead of white like it used to. and it makes me use firefox less. i think its something to do with the website contrast but I'm not sure.

I do not have the function to customize my display screen to dark anymore after the last update, why? The screen shot below used to be a White on Black screen before the last update now it Black on White and I cant change it back