I can't install add-ons, install just keeps running, when I close the browser, I'm asked if I want to cancel download.

re-install because of earlier problems, most current version. Usual plugins, all up to date.

It is possible that there is a problem with the file(s) that store the extensions registry.
Delete the extensions.* files (e.g. extensions.json, extensions.sqlite, extensions.ini) and compatibility.ini in the Firefox profile folder to reset the extensions registry.
*https://support.mozilla.org/kb/Profiles
New files will be created when required.
See "Corrupt extension files":
*http://kb.mozillazine.org/Unable_to_install_themes_or_extensions
*https://support.mozilla.org/kb/Unable+to+install+add-ons
If you see disabled or not compatible extensions in "Firefox/Tools > Add-ons > Extensions" then click the Tools button at the left end of the Search bar to check if there is a compatibility update available.
If this hasn't helped then also delete possible addons.json and addons.sqlite files.
You can reset all prefs to have a fresh start and delete possible user.js and numbered prefs-##.js files and rename (or delete) the prefs.js file to reset all prefs to the default value including prefs set via user.js and prefs that are no longer supported in the current Firefox release.
You can use this button to go to the currently used Firefox profile folder:
*Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)

Similar Messages

Can't update add-ons, install toolbars or new add-ons, get desktop shortcut icons to work, delete desktop shortcut icons, or uninstall Firefox! Help!

I have Firefox 3.6.3 running on a Toshiba Satellit laptop with Windows XP. I can't update add-ons, install google and yahoo toolbars, get any of the 3 desktop shortcuts to work or delete them, nor uninstall Firefox to try and start over. What a piece of crap! How can I wake up from this nightmare?
== This happened ==
Every time Firefox opened
== Every time I try to use Firefox.

Create a new profile as a test to check if your current profile is causing the problems
See [[Basic Troubleshooting|#Make_a_new_profile|Basic Troubleshooting: Make a new profile]]
There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins"
If that new profile works then you can transfer some files from the old profile to that new profile (be careful not to copy corrupted files)
See http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

Just updated to the newest version of Firefox and it keeps crashing when I open the browser. I tried opening it with add-ons disabled and it still keeps crashing. Crash ID: bp-03b36d11-304e-4f80-ab9e-79b7f2111223

I just updated to the newest version of firefox for my mac laptop. It keeps crashing when I open the browser and does so even in safe mode. Laptop is about two years old. Might it be an issue with the OS? I have not updated to Leopard yet.

It seems that the problem is related to fonts.
(1) How were you updating your operating system ?
If you use *_Software Update_*, hurry up, download and apply the combo updater available from :
http://support.apple.com/kb/DL1361
but CAUTION, this update introduce a serious problem with some fonts. At this time the only workaround available is to reinstall 10.6 tyhen apply the combo updater 10.6.6 available from :
http://support.apple.com/kb/dl1349
(2) if you didn't used *_Software Update_*, run a maintenance tool like the free MAINTENANCE available from :
http://www.titanium.free.fr/index_us.html
Apply it to clear caches files, mainly those dedicated to fonts.
It would be also a good idea to check the health of your fonts with FontBook.
Yvan KOENIG (VALLAURIS, France) vendredi 1 avril 2011 21:25:39

When i close the browser it ask whether you want quit or save and quit , when i selet save and quit none of te pages are saved, or if saved where can i find them?

when i close the browser it ask whether you want quit or save and quit , when i selet save and quit none of te pages are saved, or if saved where can i find them?

Make sure that you do not use [[Clear Recent History]] to clear the 'Browsing History' when you close Firefox.
* [[Firefox does not ask to save tabs and windows on exit]]

How can I keep a cookie for a certain site when I have set Firefox to delete cookies when I close the browser?

I have set Firefox to delete all cookies when I close the browser. Some websites identify my computer with a cookie, so when I try to log in to these sites, they don't recognize my computer because the identifying cookie has been deleted. I understand that Internet Explorer has a feature that preserves specified cookies, but haven't been able to find that capability in Firefox. Is there a way to do it?

Let all cookies expire when you close Firefox.
* Tools > Options > Privacy > Cookies: "Keep until": "I close Firefox"
Make an Allow exception for the ones that you want to keep.
* Tools > Options > Privacy > Cookies: "Exceptions"
You can inspect and modify the permissions for the domain in the current tab in "Tools > Page Info > Permissions"
Make sure that you do not use "Clear Recent History" to clear the "Cookies" and the "Site Preferences" (Site Preferences includes the cookie exceptions)
* https://support.mozilla.com/kb/Clear+Recent+History
Clearing cookies will remove all specified (selected) cookies including cookies that have an allow exception.
See also:
* https://support.mozilla.com/kb/Cookies
* https://support.mozilla.com/kb/Enabling+and+disabling+cookies

Why does the Welcome to firefox tab open with my google tab every time I open the browser? And why can't the browser hold any add-ons I downloaded? I loose then when I close the browser, even tool bars have to be reinstalled every time I open the browser

Every time I open the browser the Welcome to Firefox tab is the first tab, then a second tab opens and thats my google, then a 3rd tab opens for me to reinstall my toolbar. This has been happening for a good year. Updates have not fixed it. Others have this problem. I did a search for an answer, the question is out there but no answer. Now if I go into add ons and add a background Theme or an extension it all is gone when I exit the browser. When I open the browser again I get all 3 tabs and have to install my toolbar again. I DO NOT want to reinstall as I will loose all my saved data, passwords, bookmarks, everything! I have had this computer for a year, Windows Vista x64 bit. Its not the computer, it's the browser. If you have specific questions e-mail me and I will be more then happy to help

See this article for some suggestions: [[Firefox has just updated tab shows each time you start Firefox]]
See also http://kb.mozillazine.org/Preferences_not_saved and Preferences are not saved

How can I get my desktop page to open when I close the browser and then re open it?

when I click the red x to close the browser, when I come back to open the browser later, the last page I was viewing. last session opens, even all other tabs behind it, instead of my google page (my home page)? can this be fixed) I know I can just click the google word in the search bar, but should not have to do this!

{
"application": {
"name": "Firefox",
"version": "32.0.3",
"userAgent": "Mozilla/5.0 (Windows NT 6.3; WOW64; rv:32.0) Gecko/20100101 Firefox/32.0",
"supportURL": "https://support.mozilla.org/1/firefox/32.0.3/WINNT/en-US/"
"crashes": {
"submitted": [],
"pending": 9
"modifiedPreferences": {
"browser.cache.disk.capacity": 358400,
"browser.cache.disk.smart_size.first_run": false,
"browser.cache.frecency_experiment": 3,
"browser.places.smartBookmarksVersion": 7,
"browser.sessionstore.upgradeBackup.latestBuildID": "20140923175406",
"browser.startup.homepage_override.mstone": "32.0.3",
"browser.startup.homepage_override.buildID": "20140923175406",
"dom.mozApps.used": true,
"extensions.lastAppVersion": "32.0.3",
"gfx.direct3d.last_used_feature_level_idx": 0,
"network.cookie.prefsMigrated": true,
"places.history.expiration.transient_current_max_pages": 104858,
"places.database.lastMaintenance": 1413230897,
"plugin.disable_full_page_plugin_for_types": "application/pdf",
"privacy.sanitize.migrateFx3Prefs": true,
"storage.vacuum.last.places.sqlite": 1413230897,
"storage.vacuum.last.index": 0
"graphics": {
"numTotalWindows": 1,
"numAcceleratedWindows": 1,
"windowLayerManagerType": "Direct3D 10",
"windowLayerManagerRemote": false,
"adapterDescription": "AMD Radeon HD 7670M",
"adapterVendorID": "0x1002",
"adapterDeviceID": "0x6840",
"adapterRAM": "1024",
"adapterDrivers": "aticfx64 aticfx64 aticfx64 aticfx32 aticfx32 aticfx32 atiumd64 atidxx64 atidxx64 atiumdag atidxx32 atidxx32 atiumdva atiumd6a atitmm64",
"driverVersion": "13.151.0.0",
"driverDate": "8-19-2013",
"adapterDescription2": "",
"adapterVendorID2": "",
"adapterDeviceID2": "",
"adapterRAM2": "",
"adapterDrivers2": "",
"driverVersion2": "",
"driverDate2": "",
"isGPU2Active": false,
"direct2DEnabled": true,
"directWriteEnabled": true,
"directWriteVersion": "6.3.9600.17111",
"webglRenderer": "Google Inc. -- ANGLE (AMD Radeon HD 7670M Direct3D9Ex vs_3_0 ps_3_0)",
"info": {
"AzureCanvasBackend": "direct2d",
"AzureSkiaAccelerated": 0,
"AzureFallbackCanvasBackend": "cairo",
"AzureContentBackend": "direct2d"
"javaScript": {
"incrementalGCEnabled": true
"accessibility": {
"isActive": true,
"forceDisabled": 0
"libraryVersions": {
"NSPR": {
"minVersion": "4.10.6",
"version": "4.10.6"
"NSS": {
"minVersion": "3.16.5 Basic ECC",
"version": "3.16.5 Basic ECC"
"NSSUTIL": {
"minVersion": "3.16.5",
"version": "3.16.5"
"NSSSSL": {
"minVersion": "3.16.5 Basic ECC",
"version": "3.16.5 Basic ECC"
"NSSSMIME": {
"minVersion": "3.16.5 Basic ECC",
"version": "3.16.5 Basic ECC"
"userJS": {
"exists": false
"extensions": [
"name": "Logitech SetPoint",
"version": "6.5",
"isActive": false,
"id": "{F003DA68-8256-4b37-A6C4-350FA04494DF}"
"name": "Norton Toolbar",
"version": "2014.7.8.23",
"isActive": false,
"id": "{2D3F3651-74B9-4795-BDEC-6DA2F431CB62}"
"name": "Skype Click to Call",
"version": "7.3.16540.9015",
"isActive": false,
"id": "{82AF8DCA-6DE9-405D-BD5E-43525BDAD38A}"
"experiments": []
}

Can't install add-ons on my Macbook because firefox "cannot modify the needed file" !!

I am not sure how to use terminal and commands in the same. Help with the same would be greatly appreciated.

Hey,
I'm having the exact same issue, except I'm on OSX 10.8.2 and FF 16.0.1.
I can't install any extensions. If I try via Tools -> Add Ons, I get the error "There was an error installing <extension-name>". If I try via the addons.mozilla.org site I get the "can't modify file" error msg.
I have changed '''extensions.alwaysUnpack''' to ''TRUE'', but there is no change.
Any help would be greatly appreciated.

I'm using FF 4 but i wont install add ons saying I'm running FF3.

toshiba satellite l, vista/AMD xd dual core/32 bit

Your user agent string (identifies the version of Firefox) is shown as "Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5 (.NET CLR 3.5.30729) FBSMTWB" which indicates that Firefox 3.5.5 is installed.
Try resetting the user agent string so that it correctly identifies your version of Firefox:
# Type '''about:config''' into the location bar and press enter
# Accept the warning message that appears, you will be taken to a list of preferences
# In the filter box at the top type '''general.useragent''', this should bring up a small number of preferences
# Right-click on each one and choose '''Reset'''
It should hopefully then correctly identify the version of Firefox being used. The preference that is likely to have caused your problem is general.useragent.override
For more details see https://support.mozilla.com/kb/Websites+or+add-ons+incorrectly+report+incompatible+browser

I can't delete add on bar. I can only temporarly hide it. When I close the browser, then come back and open browser later, the add on bar is back again. This started right after version 11 ato uploaded to my PC. I use Windows XP, Service Pack 3.

I can't delete add on bar. I can only temporary hide it. When I close and open later, the add on bar is back. I have to delete by checking off each time I open Firefox 11. Previous versions "remembered" my original settings.

Thank you. I have been using the Fox die (Graphite) 10.3 theme for about 4 years. In all previous versions of Firefox, had no problem. When I customized the settings, Firefox remembered these settings. I like to run browser with the absolute minimum of bars, so that I have maximum view of web pages.I have had no recent add on's in over a year. When Firefox uploaded automatically recently, that's when this problem started. Now it takes 4 clicks every time I log on to Firefox to delete add on bar. Firefox won't remember the previous setting. I honestly think the bug is with the new version, being the latest.
I don't know how to start in safe mode.

Firefox now keeps my tabs when I close the browser if file manager is still open. Can I turn this off?

Used to be if I closed the browser while file manager was open it would close that session, and when I opened Firefox again, it would have a brand new session with the home page. Now I just get the same session as if I had only minimized the browser instead of closing it. Is there a way to change that?

You can set the pref browser.download.manager.quitBehavior to 2 on the about:config page. 
That will make Firefox ask for confirmation if you want to cancel the download if you close Firefox.
See:
* http://kb.mozillazine.org/browser.download.manager.quitBehavior
To open the about:config page, type about:config in the location (address) bar and press the "Enter" key, just like you type the url of a website to open a website. 
If you see a warning then you can confirm that you want to access that page.

I have Firefox 3.6.13 with Firefox for Yahoo 1.7 on Win XP and when I close the browser window, I can't open it again without using Task Manager to close firefox.exe any suggestions?

This started when I first set started using Yahoo Messenger. It appears to me that Yahoo messenger is keeping the application firefox.exe open in the background and this prevents the browser from opening. The only thing I can't understand is why the broser will open the first time with Yahoo Messenger running.

See "Hang at exit":
*http://kb.mozillazine.org/Firefox_hangs
*https://support.mozilla.com/kb/Firefox+hangs

My pc says Firefox is running after I close the browser, and will not let me access the internet. This continues even after I shut down and restart my pc. It even continues to do it after I uninstal, then reinstal Firefox. What can I do?

We tried uninstalling , tyen reinstalling Firefox, but we still get the error message that Firefox is running, and the PC won't open the browser.
We went to the Task Manager on our PC, which said Firefox was running, and told TM to close it. But, when we try to then open Firefox, we get the same error message.

See:
*https://support.mozilla.org/kb/Firefox+is+already+running+but+is+not+responding
*http://kb.mozillazine.org/Profile_in_use
Create a new profile as a test to check if your current profile is causing the problems.
See "Basic Troubleshooting: Make a new profile":
*https://support.mozilla.org/kb/Basic+Troubleshooting#w_8-make-a-new-profile
If that new profile works then you can transfer some files from the old profile to that new profile, but be careful not to copy corrupted files.
See:
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

Why can't I install free apps it just keeps going back to get the app

I can't Install a app it doesn't go through it asks for my password and when I put it in it goes straight back to get the app and I don't know why it's doing this can someone help me first

Restart is the universal cure
http://support.apple.com/kb/ht1430

My roboform toolbar has disappeared. It shows that it is enabled in add-ons but it does not show up on the browser. I am using Windows XP.

Firefox Version 22.0

Thanks for your attempted help. I went back to an earlier version of Firefox, which restored the Roboform toolbar. Then, when my automatic updater ran, the Roboform toolbar remained.
I like Firefox, but it is sometimes like a high-maintenance chick; very needy!

I can't install add-ons, install just keeps running, when I close the browser, I'm asked if I want to cancel download.

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