Hello,

The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. Note: This will cause you to lose any Extensions, Open websites, and some Preferences.

To Reset Firefox do the following:

1. Go to Firefox > Help > Troubleshooting Information.
2. Click the "Reset Firefox" button.
3. Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
4. Firefox will open with all factory defaults applied.

Further information can be found in the Refresh Firefox - reset add-ons and settings article.

Did this fix your problems? Please report back to us!

Thank you.

Hello,

Try Firefox Safe Mode to see if the problem goes away. Safe Mode is a troubleshooting mode, which disables most add-ons.

(If you're not using it, switch to the Default theme.)

• 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 the issue is not present in Firefox Safe Mode, your problem is probably caused by an extension, and you need to figure out which one. Please follow the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article for that.

To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.

When you figure out what's causing your issues, please let us know. It might help other users who have the same problem.

Thank you.

Hi, Could not open Firefox in SafeMode even with the two option mentioned.

Please check the attached image of the problem i am having. Thanks.

Issue snap.

Have you restarted Windows since this started, in case there is an intermittent permission or file lock issue?

Another way to access Safe Mode or Reset is to hold the Shift button when starting Firefox. You should get a small dialog pictured in this article: Diagnose Firefox issues using Troubleshoot Mode.

Can you reset Firefox by using the steps i provided above? or create a new profile.

• Profile Manager - Create, remove or switch Firefox profiles
• Refresh Firefox - reset add-ons and settings

HI, I did try with the removal of profile and reset firefox but no change.

Thank you

can you reproduce this in windows safe mode?

• windows.microsoft.com/en-us/windows/start-computer-safe-mode

It's working fine when i started firefox in windows safemode. But even after reseting the firefox it's not working in normal mode.

Thanks.

Try scanning your computer for viruses and malware.

Then use a registry cleaner to remove bad registries. I recommend using CCleaner because that is what I use and it works perfectly.

This looks like a problem with a missing or corrupted font.

You can do a font test to see if you can identify corrupted font(s).

• http://browserspy.dk/fonts-flash.php?detail=1

You can use the System File Checker to check if font files are missing or corrupted.
Open a cmd.exe window as Administrator:
Start, click Programs, click Accessories, right-click Command Prompt, and then click Run as administrator.
After the cmd.exe prompt, type: sfc.exe /scannow

• http://www.sevenforums.com/tutorials/1538-sfc-scannow-command-system-file-checker.html

Hi, Tried with CCleaner and scaned. But still issue is same.

Thanks

Did you do a font check?

This is a likely font issue.
Firefox shows those little square boxes if there isn't a font available that maps those characters and I see characters in the normal ASCII range (0x20-0x6f) in the first screnshots.

Yes i did the font check as per the instruction provided in the previous. All the font were fine.

Thanks

Misread the history here and thought the most recent reference to Safe Mode was to Firefox Safe Mode.

Safe Mode also disables Firefox's use of hardware acceleration for graphics. This is helpful when Firefox is not fully compatible with your graphic card drivers. You can manually turn that off for normal mode.

You generally need to restart Firefox in order for this to take effect, so save all work first (e.g., mail you are composing, online documents you're editing, etc.).

orange Firefox button (or Tools menu) > Options > Advanced

On the "General" mini-tab, uncheck the box for "Use hardware acceleration when available"

If you restart Firefox, is the issue resolved (or at least improved)?

You can try to set gfx.font_rendering.directwrite.use_gdi_table_loading to false on the about:config page.

• http://kb.mozillazine.org/about:config

Unable to perform any activity as all the menu are also affected.

Thanks.

Could you try temporarily forcing your default Firefox fonts to "Times New Roman" and "Arial"? You can do that by opening your currently active profile folder and creating a new text file named user.js with these lines:

user_pref("font.name.sans-serif.x-unicode", "Arial");
user_pref("font.name.sans-serif.x-western", "Arial");
user_pref("font.name.serif.x-unicode", "Times New Roman");
user_pref("font.name.serif.x-western", "Times New Roman");

That might not affect dialogs, though.