Showing questions tagged: Show all questions
  • Solved
  • Archived

"Update could not be installed. Make sure there is not another instance of Firefox. Restart and try again." Again

Started w/FF 29 something.on Win XP (Home) SP3 Verified w/Task manager and PS that there is no other instance of FF. Occurs only in my profile, administrator and other us… (read more)

Started w/FF 29 something.on Win XP (Home) SP3

Verified w/Task manager and PS that there is no other instance of FF. Occurs only in my profile, administrator and other users do not get this message.

The fix I used last time (uninstalling completely and reinstalling in Safe Mode) ***did not work in this instance***.

Firefox now version 33.1.1, all seems up to date but I still get that message. When I open Help > About it says I am at version 33.1.1 and to restart to upgrade...

Any ideas greatly appreciated.

Asked by sprytely 5 years ago

Answered by sprytely 5 years ago

  • Solved
  • Archived

Where are offline installers for firefox?

Where can I find offline installations for Firefox? Please don't say "https://www.mozilla.org/firefox/all/" like the previous 20 or so answers to this question. It simply… (read more)

Where can I find offline installations for Firefox? Please don't say "https://www.mozilla.org/firefox/all/" like the previous 20 or so answers to this question. It simply doesn't work. All you get are Stub installers with no option to download only. I have gone as far as completely trying this and the only thing that I could achieve was to upgrade Firefox on the download computer. Why has this Full install thing been a never ending issue with Mozilla? Is it so hard to list these as well as the Installer version? Many people don't like installers.

Asked by brookspd 5 years ago

Answered by James 5 years ago

  • Solved
  • Archived

When i downloaded your browser it already had malware in it. I can't use firefox unless you get assure me it does not come with malware.

Firefox had malware in it that defeats my ability to get rid of it. So I got rid of firefox and decided to download a whole new updated firefox. And it had the same mal… (read more)

Firefox had malware in it that defeats my ability to get rid of it. So I got rid of firefox and decided to download a whole new updated firefox. And it had the same maleware in it! That cryptosearch engine or whatever it is. And I cannot get rid of it no matter what. Even new Firefox the cryptosearch engine is in it already! How can this be fixed?

Asked by marbirns 2 years ago

Answered by FredMcD 2 years ago

  • Solved
  • Archived

Firefox crashes. Couldn't load XPCOM. Clean reinstall didn't help

Firefox crashes. Couldn't load XPCOM. Clean reinstall didn't help. Scanned with antivirus - no malwares. Just found and deleted avery file\folder with "Mozilla" in it, cl… (read more)

Firefox crashes. Couldn't load XPCOM. Clean reinstall didn't help. Scanned with antivirus - no malwares. Just found and deleted avery file\folder with "Mozilla" in it, cleaned the regystry - no luck... please help me

Asked by link_777 8 months ago

Answered by FredMcD 8 months ago

  • Solved
  • Archived

Version issue connecting Android to Firefox

Hi. I use Firefox from many years. Today I was trying to inspect a my web page which looks strange in my Firefox for Android but I just can't. In my desktop I have Firefo… (read more)

Hi. I use Firefox from many years. Today I was trying to inspect a my web page which looks strange in my Firefox for Android but I just can't. In my desktop I have Firefox 73.0.1 and in my Android phone I have Firefox 68.5.0. If I try to connect I get a message which tells to update Firefox from 68.5 to 71.0 (minimum supported version) but I can't find this version anywhere. I have installed Firefox Nightly for Developer in my phone but now the problem is that the version is too recent... What should I do?

Asked by Marco 8 months ago

Answered by cor-el 7 months ago

  • Solved
  • Archived

got hacked after FF forum help and fix

in the past days ( I don' know hoe to find my post) I was seeking help from you, in short I was instructed on doing a clean install after that I go hacked, ran my spy pro… (read more)

in the past days ( I don' know hoe to find my post) I was seeking help from you, in short I was instructed on doing a clean install after that I go hacked, ran my spy protectors got rid of 110++ issues win essential cleaned a couple, but after running programs I had only run on Friday 15th jan which showed no threats I get this and after getting rid of threats I opened FF to only get hit with the same hack stuff, so sadly after a decade relationship I have uninstalled FF

this is for you FYI

Asked by lensgarden 4 years ago

Answered by cor-el 4 years ago

  • Solved
  • Archived

FireFox will not start up

Firefox magically stopped working tonight. Based on reading help files and past forum posts, here are things I've tried with no luck: Note: Running Windows 7 - Rebooted (… (read more)

Firefox magically stopped working tonight. Based on reading help files and past forum posts, here are things I've tried with no luck:

Note: Running Windows 7

- Rebooted (of course) - Uninstalled through the task manager and reinstalled. - Uninstalled and deleted the C:/Program Files/Mozilla Firefox directory and reinstalled - Once reinstalled, attempted to start in safe mode via holding down Shift while loading - Attempted to start in safe mode by attempting to type many things in the run window:

        Firefox -safe-mode
        Firefox /safe
        "C:\Program Files\Mozilla Firefox\firefox.exe" -safe-mode

- Attempted to add a new profile by typing in the Run window (after reinstalling):

        "C:\Program Files\Mozilla Firefox\firefox.exe" -P 

None of these solutions have had any results. No matter what I do, no Firefox related windows will come up and I get no error messages of any kind. Most of the time I at least get a busy cursor for a second and a firefox.exe process will start. I've kept the Task Manager open through most of the attempts and killed firefox.exe between all different attempts. Most everything I do will still open a process (I have two of them still running right now) and I kill all of them in between attempts, not to mention shutting down. I even did a hard battery pull on my laptop just to be sure. I'm not making any headway. If I could at least get an error message that would be nice, but I get nothing at all. Any other suggestions?

Asked by Snooj 3 years ago

Answered by FredMcD 3 years ago

  • Solved
  • Archived

Firefox 56/57 for Mac crashes on startup - every time. (Despite clean reinstall)

Hi all, I rely heavily on FireFox (primarily for the multiple profiles and extensions it provides), so deperately trying to solve a problem I'm having. When I launch Fire… (read more)

Hi all,

I rely heavily on FireFox (primarily for the multiple profiles and extensions it provides), so deperately trying to solve a problem I'm having. When I launch Firefox on my Mac (10.12.6 - Sierra), I immediately receive an error: "Firefox quit unexpectedly."

I've tried a number of different approaches to resolve including:

1) Starting Firefox in safe mode (by holding down the opt key on launch) - same error occurs 2) Removing Firefox from the Applications folder, and removing Firefox folder from the Application Support folder under the Library (which also removes all my profiles). Then reinstalled Firefox 57. - same error occurs 3) Tried installing older version of Firefox - version 56.0.2 (after removing previous installation as per step 2 above) - same error occurs 4) Tried a machine restart (very early on) - same error occurs.

I've run out of ideas, and hoping someone may be able to shed some light or suggest further troubleshooting options? Desperate to get it working again!

Cheers, Mark

The detailed error report (or at least the start of it) is here:

Process: firefox [1511] Path: /Applications/Firefox.app/Contents/MacOS/firefox Identifier: org.mozilla.firefox Version: 56.0.2 (5617.10.24) Code Type: X86-64 (Native) Parent Process:  ??? [1] Responsible: firefox [1511] User ID: 1342407268

Date/Time: 2018-01-08 14:25:11.798 +1100 OS Version: Mac OS X 10.12.6 (16G1114) Report Version: 12 Anonymous UUID: C6B6E4AB-1DE7-8875-3841-965087F69AAD


Time Awake Since Boot: 820 seconds

System Integrity Protection: enabled

Crashed Thread: 1

Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0x0000000106f5bc92 Exception Note: EXC_CORPSE_NOTIFY

Termination Signal: Segmentation fault: 11 Termination Reason: Namespace SIGNAL, Code 0xb Terminating Process: exc handler [0]

Asked by ms1900 2 years ago

Answered by ms1900 2 years ago

  • Solved
  • Archived

when ever I run Firefox.exe I get an error of "The data is invalid" but if I rename firefox.exe to firefox1.exe it runs with no problems.

Ever since Firefox nightly did an update a few days ago, I have been unable to run it from the normal shortcut. I had to make a copy of the exe and rename it and only the… (read more)

Ever since Firefox nightly did an update a few days ago, I have been unable to run it from the normal shortcut. I had to make a copy of the exe and rename it and only then would it work from the renamed file. If I click a link in Thunderbird, for example it still looks for Firefox.exe and not the renamed file. If I change the tile to Firefox.exe.bak so that only Firefox1.exe is accessible, I still have to run it manually from that new file name rather than the default. This is a new install of Windows 7 x64 Ultimate and this is the only time I have ever had problems with nightly. Now, when I restart the browser, it downloads a new firefox.exe and the error returns. I would rather try and fix the problem than remove all traces of it then reinstall, that would be like ignoring the problem and starting over which won't 'fix' the error that others might have.

Asked by tallon1999 1 year ago

Answered by tallon1999 1 year ago

  • Solved
  • Archived

<window id="main-window

Hello everybody, i have just finished a big long windows update and since then i cannot open the firefox browser. Even if i download a new firefox version i cannot open i… (read more)

Hello everybody, i have just finished a big long windows update and since then i cannot open the firefox browser. Even if i download a new firefox version i cannot open it: In the 2 instances, a window pops up with this message "<window id="main-window". Thank you for your time and your help. Patrick

Asked by Pat777 1 year ago

Answered by cor-el 1 year ago

  • Solved
  • Archived

FF takes 2 or more min. to initially load in Win10 1903 (was worse in 1909), loads fast after

Have re-installed FF several times, no improvement in initial startup time. Often have to initiate as admin. 73.0.1 (32-bit) This HP Elitebook 840 G3 running Windows … (read more)

Have re-installed FF several times, no improvement in initial startup time. Often have to initiate as admin.

73.0.1 (32-bit)

This HP Elitebook 840 G3 running Windows 10 v 1903 64-bit. Have to be careful re-installing as FF wants to make my extensions in GERMAN! Are OK now (see attachment). Have test-removed AdGuard, NO difference, so added it back.

NOTE: screenshot is long out-of-date: AdNauseum removed long before this issue started

Asked by xlcrlee 8 months ago

Answered by xlcrlee 8 months ago

  • Locked
  • Archived

i am using cent os 6.5 with firefox 31.1.0 ..Now i am facing big problem for adding flash palyer in firefox browser.So how to install flash player ?

i am using cent os 6.5 with firefox 31.1.0 ..Now i am facing big problem for adding flash palyer in firefox browser.So how to install flash player ? i did manually using… (read more)

i am using cent os 6.5 with firefox 31.1.0 ..Now i am facing big problem for adding flash palyer in firefox browser.So how to install flash player ? i did manually using RPM package ..but not supported in firefox ...i tried all possibilities using forums ..

Asked by Manbumihu Manavan 5 years ago

Last reply by James 5 years ago

  • Solved
  • Archived

shockwave flash 16.0.0.235 installed, it is a security risk, cannot update it

There is an outdated page on the Adobe Flash web site being blocked by Firefox 35.0.1 on Windows 7. Version 16..0.0.235 of Flash is labeled a security risk, "Always activ… (read more)

There is an outdated page on the Adobe Flash web site being blocked by Firefox 35.0.1 on Windows 7. Version 16..0.0.235 of Flash is labeled a security risk, "Always activate" is greyed out. I was on the Plugins page, and there I clicked the update now linktext. I was advised that all older versions of Flash in the version 11 range are blocked. Nowhere to go from there. (My screenshot has a piece off the Plugins page above the resulting page when I clicked on the indicated link.)

The outdated page being blocked was allowed and I was able to run through the download procedure, but in the end I had an error. I repeatedly tried downloading install_flashplayer16x32_mssd_aaa_aih.exe, which downloads OK, and when I run it it downloads and installs Adobe Flash, then says Finish and "There was an error."

Glary Utilities software updater updated Internet Explorer's Flash, said nothing of Firefox, now I know why. This is a mess.

I opened up firefox -p and went to the new blank profile I had created sometime back. It was happily running a fully-enabled version 11 of Flash (I bet that wouldn't last long as my browser bites me in the butt and disables it).

Firefox -p and I created a new profile today. It has this crippled version 16.0.0.235 of Flash.

It appears that Mozilla has an outdated page telling me that all old versions in the range of version 11 are blocked. No word there about the more recent versions.

From what else I've read, others are turning to other browsers and coming up with a bad Flash, too. I only have Firefox (well, Internet Exploder, which I discounted as a piece of rubbish ever since they came out with IE 7).

Any advice? Thank you.

Asked by Linux_Mint_Firefox 5 years ago

Answered by FredMcD 5 years ago

  • Solved
  • Archived

I am trying to download a clean install, but only got partial and it failed

I uninstalled Firefox to install a new one because I was having MANY issues recently. However, I am only getting a partial download and a message that download failed … (read more)

I uninstalled Firefox to install a new one because I was having MANY issues recently. However, I am only getting a partial download and a message that download failed

Asked by kaylaartist 4 years ago

Answered by FredMcD 4 years ago

  • Solved
  • Archived

Links from external programs don't open in Firefox 54. It just opens up a window with my home page.

Hello I recently downloaded the latest version of Firefox 54 for Linux. Everything worked great however even after making it the default browser links from external progr… (read more)

Hello I recently downloaded the latest version of Firefox 54 for Linux. Everything worked great however even after making it the default browser links from external programs such as Pidgin won't open in a new tab in firefox. Instead a new window will pop-up with my home page. I've tried solving it by uninstalling the other version of firefox I downloaded from the repository (Firefox 45)

I fear it might be because I didn't really install it, instead I just ran the file directly form the download labed just firefox. It seems to be working fine and there was no README file so I assumed that was the way it should've been done.

Asked by AnimatedFreak 3 years ago

Answered by bygabyga 3 years ago

  • Solved
  • Archived

Since I downloaded Firefox I cannot launch Safari and it is my default browser

When I click and hold on the compass icon I am asked to "force quit". I cannot launch Safari and before I downloaded Firefox I could. I only downloaded firefox because I… (read more)

When I click and hold on the compass icon I am asked to "force quit". I cannot launch Safari and before I downloaded Firefox I could. I only downloaded firefox because I registered for classes at a community college and they said to use Firefox and not Safari. I would like to dump firefox now.

Asked by Neeters42 2 years ago

Answered by FredMcD 2 years ago

  • Solved
  • Archived

Under Wndows XP, Firefox will no longer start, and won't reinstall or install

I had been running the latest version (52.8) of Firefox supported under Windows XP, but now I can no longer run Firefox, and, worse, cannot reinstall it. On June 7, Fire… (read more)

I had been running the latest version (52.8) of Firefox supported under Windows XP, but now I can no longer run Firefox, and, worse, cannot reinstall it.


On June 7, Firefox lost all the tabs from the previous day. This happens from time to time, and it's simplest first to try restoring Windows to the previous checkpoint: this is sometimes successful in that Firefox then does display tabs. I restored Windows to the then most recent checkpoint, June 6, only to find the attempted cure worse than the disease: Firefox would not even start. There were no messages of any type.

Attempts either to create a new Firefox profile (-p) or to start Firefox in safe mode (Shift) were no different. Windows Task Manager showed no evidence, however transient, of either any Application or Process for Firefox. Again, there were no messages of any type.

Restoring Windows to still earlier dates produced the same situation: Firefox would not run, exactly as after the initial restoration.

Deleting the (only) Firefox profile made no difference.


All subsequent attempts to reinstall Firefox--whether or not Firefox had been uninstalled--have been equally unsuccessful, and equally mute.

Program Firefox Installer.exe (306 KB in size, downloaded from https://stubdowloader.cdn.mozilla.net, for example) begins a process which occupies either 2,484KB or 2,488KB of storage, but which does nothing. I tried several Firefox installers (all downloaded via various links from Mozilla): all are bit-for-bit identical, albeit with one occasional exception, i.e., sometimes a string is "duckduckgo.", and sometimes it's "getfirefox-". None of these installers produces any message, and each creates a process which occupies c. 2.5MB and then does nothing.

Knowing that it would not run successfully under Windows XP, I nonetheless tried later Firefox installers (e.g., Firefox Setup 60.0.2.exe downloaded from https://download-installer.cdn.mozilla.net). Rather than my receiving the expected message saying that 60.0.2 isn't supported on Windows XP, this installer, too (once it's used some amount of both CPU and storage), is simply suspended occupying 2,544KB and staying silent.


The following may or may not be relevant.

1. Running any of these installers (and also firefox.exe itself) from a CMD window confirms instant termination. Even from the CMD window, it remains the case that the installers create a process occupying c. 2.5MB. (I didn't try Firefox Setup 60.0.2.exe from the CMD window.)

2. Things are essentially the same in Windows Safe Mode, with the following differences. (a) The 306 KB installers occupy slightly less storage: c. 2.2 MB instead of c. 2.5 MB. (2) Clicking on the Firefox shortcut and selecting "Run As" with the same account produces the message "A device attached to the system is not functioning"; a 'Web search for his message turns up nothing relevant.


The current situation is that Windows was restored to the most recent checkpoint, June 6, as in the second paragraph (although obviously Windows has taken later checkpoints, so that the June 6 checkpoint has been overwritten), and Firefox is installed. Firefox still won't run, and none of the installers produces any output.

FWIW, I'd wondered whether Firefox might simply be refusing to run any longer on Windows XP, but recent tests show that the Firefox-based TOR browser runs from a memory stick just as normal.

Asked by Chester_Babcock 2 years ago

Answered by Chester_Babcock 2 years ago

  • Solved
  • Archived

How do I stop recurring registry errors from returning and slowing down my computer?

Hi all. Seems like after updates, my computer slows down. It has become so recognizable, I know when the registry errors appear, as my computer performance falls off. … (read more)

Hi all. Seems like after updates, my computer slows down. It has become so recognizable, I know when the registry errors appear, as my computer performance falls off. I must use Reginout Registry cleaner, and CC Cleaner to restore performance. Along with any FireFox updates, my bookmarks have all been deleted many times over. I no longer attempt to re-install, as they continually get deleted, and so simple fix is available to me that I can understand. Thank you.

Asked by a3wayat 1 year ago

Answered by Chris Ilias 1 year ago

  • Solved
  • Archived

you auto updated and now I have lost all bookmarks and function of foxfire

Foxfire auto updated the program and it lost all bookmarks and even login. The result is I cannot do anything with my computer that needs the internet. I have spent man… (read more)

Foxfire auto updated the program and it lost all bookmarks and even login. The result is I cannot do anything with my computer that needs the internet. I have spent many hours trying the suggested fixes and I cannot get them back and I do not have my password so that I cannot change if for fear I will loose access to the bookmarks. There seems to be no accountability from Mozilla and no way to reach any one. Is anyone else having this problem.

Asked by TerrelF 1 year ago

Answered by jscher2000 1 year ago