Firefox 21 running on Windows 7 won't allow creation of new bookmarks

I just installed Firefox 21 on a PC running Windows 7. I cannot access the "About" screen, and Firefox will not create new bookmarks. Neither clicking on the star in the navigation window or right-clicking the dropdown menu works.
I might add that every time Firefox has installed a new version after version 19, some such problem has arisen. What gives?

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
 To Enable SafeMode 
*You can open Firefox 4.0+ in Safe Mode by holding the '''Shift''' key when you open the Firefox desktop or Start menu shortcut.
* Or open the Help menu and click on the '''Restart with Add-ons Disabled...''' menu item while Firefox is running.
*''Once you get the pop-up, just select "'Start in Safe Mode"''
If it works in Safe Mode and in normal mode with all extensions (Tools > Add-ons > Extensions) disabled then try to find which extension is causing it by enabling one extension at a time until the problem reappears.
Close and restart Firefox after each change via "Firefox > Exit" (Windows: Firefox/File > Exit; Mac: "Firefox > Quit Firefox"; Linux: "Firefox/File > Quit")
* https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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Hey Elaine07!
I have an article here that can help you with that issue. This article will help you make sure you have uninstalled iTunes correctly and help you troubleshoot the launch issues you are seeing:
iTunes for Windows Vista or Windows 7: Troubleshooting unexpected quits, freezes, or launch issues
http://support.apple.com/kb/ts1717
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Post your iTunes questions in the iTunes forum. Maybe these will help as well:
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It might be that you are logged in with HTTP authentication (either basic or digest). This authentication is arranged by the browser, so you would have seen a pop-up dialog asking for a user name and password while logging in. It seems that these are cached by the browser and it requires you to restart the browser to log out...
http://en.wikipedia.org/wiki/Basic_access_authentication
http://www.tolaris.com/2009/09/08/logging-out-of-http-auth-with-firefox/
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Firefox is running, but window is not visible

I am running a recent version (updated 9/11/2012 ... but I can't get to it to see the version number) of Firefox on Windows 7. Firefox is running, I can close it using the Windows task bar or Task Manager, and when I reopen it, I briefly (< 1 sec) see a full-screen window, then it goes away. I can hover over the taskbar icon and see a thumbnail of the page it has open, but can't get it to show the full window.
I've tried using Task Manager's Switch To and Bring to Front features to no avail. I rebooted the computer and still get the same behavior.
Any ideas?

Hi,
You can try deleting the '''localstore.rdf''' and '''sessionstore.js''' files in the [http://kb.mozillazine.org/Profile_folder Firefox Profile Folder]. Before that, you can also try to '''Shift''' + '''Right-click''' the '''Taskbar''' icon > '''Move''', move the mouse once without clicking, and then use the arrow keys on the keyboard. You may have to experiment with the four arrow keys. Hopefully the window will appear.
[http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder & Files]

Will Firefox 4 run on Windows 95? I have a cousin I am trying to get to dump Internet Explorer.

Got a cousin still using windows 95. Will Firefox run on Windows 95? What do you consider the minimum amount of memory for firefox to run properly?
Thanks..

Firefox 4 will not run on Windows 95.
http://www.mozilla.com/en-US/firefox/system-requirements.html
I would not recommend Firefox to Windows 95 users, the last version that was officially supported on Windows 95 was Firefox 1.5.0.12

I install compatibility reporter in my Mozilla firefox 5 running under Windows 7 and get message - TypeError: Components.classes[cid] is undefined, what is causing it please?

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If you force an extension to install by overriding the compatibility then the result can be unpredicted. 
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* http://kb.mozillazine.org/extensions.checkCompatibility

WHENEVER I DOWNLOAD FIREFOX CONSUMES MY ENTIRE SCREEN AND WON'T ALLOW ME TO SHRINK IT

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I assume Keypass is an add-on, so in order to regain access to Firefox without it, you could try starting Firefox in its Safe Mode. That's a standard diagnostic tool to deactivate extensions and some advanced features of Firefox. More info: [[Troubleshoot Firefox issues using Safe Mode]].
''If Firefox is not running:'' Hold down the Shift key when starting Firefox.
''If Firefox is running:'' You can restart Firefox in Safe Mode using either:
* "3-bar" menu button > "?" button > Restart with Add-ons Disabled
* Help menu > Restart with Add-ons Disabled
and OK the restart.
''Both scenarios:'' A small dialog should appear. Click "Start in Safe Mode" (''not'' Refresh).
Can you get to your home page?
If Firefox is stuck in "full screen" view, then the F11 key should switch it back to normal view (or vice versa). If Firefox is in normal view but the window is just way too big, please see Fred McD's suggestion.
Finally, if Firefox is distorting the screen resolution of your system while you are using it, make sure you have not set backwards compatibility options in the shortcut you use to start Firefox. Right-click the shortcut > Properties, Compatibility. On that tab, uncheck boxes and deselect old versions to make sure Firefox uses the full capabilities of Windows 7.

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I am using Safari, Mavericks, and MacBook Pro.

Your control is allowing the app to run or not. I'm not sure what other type of control you could possibly mean since any app, once running, does whatever it does; you can't control any app past that point.
If you prefer not to disable the settings in the System Preferences, then right click on the app and choose Open. That will allow that app to run while still leaving the basic security feature on. You only need to do this once. The app will be assumed as trusted after that.

Why don't my existing bookmark folders show up in the edit bookmark window? How do I put a new bookmark in an existing folder in one step?

When you create a new bookmark by selecting the 'bookmark this page' command or clicking on the star next to the address, existing bookmark folders don't show up anywhere in the window. The only folder options are 'bookmarks toolbar', 'bookmarks menu' & 'unsorted bookmarks', non of which expand to show existing folders.

Try this extension:
Add Bookmark Here ² :
https://addons.mozilla.org/en-US/firefox/addon/3880

Firefox 3.6.3, running in Windows 7, won't save my passwords.

== Issue
==
I have another kind of problem with Firefox
== Description
==
I'm operating in Windows 7 and recently upgraded to Firefox 3.6.3. I can no longer save my passwords. I've tried the fixes on line, but they make no sense.
== This happened
==
Every time Firefox opened
== I upgraded to 3.6.3
==
== Troubleshooting information
==
Application Basics
Name
Firefox
Version
3.6.3
Profile Directory
Open Containing Folder
Installed Plugins
about:plugins
Build Configuration
about:buildconfig
Extensions
Name
Version
Enabled
ID
Adblock Plus
1.2
true
BetterPrivacy
1.47.4
true
Click&Clean
3.6.5.0
true
[email protected]
HistoryBlock
1.3.5
true
historyblock@kain
Malware Search
0.9.1
true
{27c60876-b5c9-4335-b4f3-52b26782220c}
Move Media Player
1.0.0.071303000006
true
[email protected]
PlacesCleaner
0.3.5.2
true
[email protected]
WOT
20100503
true
Password Exporter
1.2
true
Modified Preferences
Name
Value
accessibility.typeaheadfind.flashBar
0
browser.history_expire_days.mirror
180
browser.history_expire_days_min
30
browser.places.importBookmarksHTML
false
browser.places.smartBookmarksVersion
2
browser.startup.homepage
http://www.yahoo.com
browser.startup.homepage_override.mstone
rv:1.9.2.3
extensions.lastAppVersion
3.6.3
network.cookie.prefsMigrated
true
places.last_vacuum
1275323020
print.print_printer
Acquisition
print.printer_Acquisition.print_bgcolor
false
print.printer_Acquisition.print_bgimages
false
print.printer_Acquisition.print_command
print.printer_Acquisition.print_downloadfonts
false
print.printer_Acquisition.print_edge_bottom
0
print.printer_Acquisition.print_edge_left
0
print.printer_Acquisition.print_edge_right
0
print.printer_Acquisition.print_edge_top
0
print.printer_Acquisition.print_evenpages
true
print.printer_Acquisition.print_footercenter
print.printer_Acquisition.print_footerleft
&PT
print.printer_Acquisition.print_footerright
&D
print.printer_Acquisition.print_headercenter
print.printer_Acquisition.print_headerleft
&T
print.printer_Acquisition.print_headerright
&U
print.printer_Acquisition.print_in_color
true
print.printer_Acquisition.print_margin_bottom
0.5
print.printer_Acquisition.print_margin_left
0.5
print.printer_Acquisition.print_margin_right
0.5
print.printer_Acquisition.print_margin_top
0.5
print.printer_Acquisition.print_oddpages
true
print.printer_Acquisition.print_orientation
0
print.printer_Acquisition.print_pagedelay
500
print.printer_Acquisition.print_paper_data
1
print.printer_Acquisition.print_paper_height
11.00
print.printer_Acquisition.print_paper_size_type
0
print.printer_Acquisition.print_paper_size_unit
0
print.printer_Acquisition.print_paper_width
8.50
print.printer_Acquisition.print_reversed
false
print.printer_Acquisition.print_scaling
1.00
print.printer_Acquisition.print_shrink_to_fit
true
print.printer_Acquisition.print_to_file
false
print.printer_Acquisition.print_unwriteable_margin_bottom
0
print.printer_Acquisition.print_unwriteable_margin_left
0
print.printer_Acquisition.print_unwriteable_margin_right
0
print.printer_Acquisition.print_unwriteable_margin_top
0
print.printer_PDF_Writer.print_bgcolor
false
print.printer_PDF_Writer.print_bgimages
false
print.printer_PDF_Writer.print_command
print.printer_PDF_Writer.print_downloadfonts
false
print.printer_PDF_Writer.print_edge_bottom
0
print.printer_PDF_Writer.print_edge_left
0
print.printer_PDF_Writer.print_edge_right
0
print.printer_PDF_Writer.print_edge_top
0
print.printer_PDF_Writer.print_evenpages
true
print.printer_PDF_Writer.print_footercenter
print.printer_PDF_Writer.print_footerleft
&PT
print.printer_PDF_Writer.print_footerright
&D
print.printer_PDF_Writer.print_headercenter
print.printer_PDF_Writer.print_headerleft
&T
print.printer_PDF_Writer.print_headerright
&U
print.printer_PDF_Writer.print_in_color
true
print.printer_PDF_Writer.print_margin_bottom
0.5
print.printer_PDF_Writer.print_margin_left
0.5
print.printer_PDF_Writer.print_margin_right
0.5
print.printer_PDF_Writer.print_margin_top
0.5
print.printer_PDF_Writer.print_oddpages
true
print.printer_PDF_Writer.print_orientation
0
print.printer_PDF_Writer.print_pagedelay
500
print.printer_PDF_Writer.print_paper_data
1
print.printer_PDF_Writer.print_paper_height
11.00
print.printer_PDF_Writer.print_paper_size_type
0
print.printer_PDF_Writer.print_paper_size_unit
0
print.printer_PDF_Writer.print_paper_width
8.50
print.printer_PDF_Writer.print_reversed
false
print.printer_PDF_Writer.print_scaling
1.00
print.printer_PDF_Writer.print_shrink_to_fit
true
print.printer_PDF_Writer.print_to_file
false
print.printer_PDF_Writer.print_unwriteable_margin_bottom
0
print.printer_PDF_Writer.print_unwriteable_margin_left
0
print.printer_PDF_Writer.print_unwriteable_margin_right
0
print.printer_PDF_Writer.print_unwriteable_margin_top
0
privacy.sanitize.migrateFx3Prefs
true
privacy.sanitize.timeSpan
0
security.warn_viewing_mixed
false
== Firefox version
==
3.6.3
== Operating system
==
Windows 7
== User Agent
==
Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3
== Plugins installed
==
*-npmnqmp 071303000006
*Adobe PDF Plug-In For Firefox and Netscape "9.3.2"
*Shockwave Flash 10.0 r45
*NPRuntime Script Plug-in Library for Java(TM) Deploy

Do you see any passwords in the Firefox Password Manager?
Tools > Options > Security: Passwords: "Saved Passwords" > "Show Passwords"
If not then delete key3.db and signons.sqlite as suggested in the Troubleshooting section.
http://kb.mozillazine.org/Password_Manager (Troubleshooting)
You need to set a new Master Password after renaming or deleting [http://kb.mozillazine.org/key3.db key3.db] and you lose all your currently saved passwords.
See also [[Protecting stored passwords using a master password]]

Firefox 6 running under Windows 7 64-bit does not render fonts correctly.

The default sans-serif font for Firefox is Arial. Running Firefox 6 under Windows 7 32-bit, the font renders properly, but under 64-bit Win7, the font is too heavy, and bold or strong makes no difference. I run Win7 64-bit on a laptop computer and use Firefox 5 on it, and the fonts render properly. Possibly a Firefox 6/64-bit problem?

Hi strangerland, don't give up hope -- I'm using Firefox 36.0.4 on Windows 7 right now.
That said, I understand troubleshooting fatigue and when you find time to think about Firefox again, and have the opportunity to shut down and restart Windows, you might try testing in Windows Safe Mode with Networking, a mode that blocks some external programs that can interfere with Firefox.
* [http://windows.microsoft.com/en-us/windows/advanced-startup-options-including-safe-mode#1TC=windows-7 Advanced startup options (including safe mode) - Windows Help]
* [http://windows.microsoft.com/en-us/windows/start-computer-safe-mode#start-computer-safe-mode=windows-7 Start your computer in safe mode - Windows Help]

How can I get Firefox to run on Windows 8 Start page instead of my Desktop?

I have the Icon for Firefox on my Windows 8 Start page, but when I click on the icon to use the Internet my view goes straight to my desktop.

hi WarriorEthos, firefox on windows is a desktop-only application. it does not run in "metro" mode.

Does firefox 4 run on windows-64 bit operating systems

please let know the response quickly..does firefox 4 work on 64-bit o/s

Firefox 4 is a 32 bit application but it works on 64 bit Windows.

Firefox in a limited Windows account won't search using in-built search engines on the search bar + awesome bar.

It works in the administrator account but not for all other limited accounts. I created a new limited account so it had no addons or changed options but search still did not work.
If I enter anything in the awesome bar/ search bar, it shows "Looking up nameofwebsite.com" instead of "Waiting for nameofwebsite.com".
I noticed that it searches using https:. If I search using google, I can take out the s part of https so that the http protocol is used, and when I press enter, it works, but the browser adds in the s and searches in https.
Everything else works fine except for the search capabilities.

Weird. Last time I tried Wikipedia, it came with a connection error. Now it doesn't and Wikipedia search now works. I think that simply restarting the computer fixed this Wikipedia problem. Now this is the status of Firefox:
* Google Search = Works
* Bing search = Works
* Amazon Search = Works
* Ebay Search = Works
* Wikipedia Search = Works
* Twitter Search = Certificate Error (Doesn't have the 'Add Exception' Option)
* Yahoo search = Certificate Error (Has the 'Add Exception' Option)
I previously added Google as an exception, but I discovered that Bing, Amazon, Ebay and Wikipedia now work too. I would like to find out if I can use these services securely because I'm worried that their encryption might be broken, etc.
I would also like to find out how to fix Yahoo and Twitter Search.
Is there like any settings under about:config that I could change or anything that I could look under the certificate that would help?
When I type 'asdf' (without quotes) in Yahoo search, it autocompletes to 'https://search.yahoo.com/search?p=asdf&ei=UTF-8&fr=moz35'. If I do the same with Twitter search, it autocompletes to 'https://twitter.com/search?q=asdf&partner=Firefox&source=desktop-search'.
I uploaded screenshots of the error pages:
'''Yahoo'''
https://support.cdn.mozilla.net/media/uploads/images/2014-07-18-01-20-57-241fe8.png
'''Twitter'''
https://support.cdn.mozilla.net/media/uploads/images/2014-07-18-01-22-52-b73c2d.png

Firefox 21 running on Windows 7 won't allow creation of new bookmarks

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