Hello,

Try Firefox Safe Mode to see if the problem goes away. Firefox Safe Mode is a troubleshooting mode that turns off some settings, disables most add-ons (extensions and themes).

If Firefox is open, you can restart in Firefox Safe Mode from the Help menu:

• In Firefox 29.0 and above, click the menu button , click Help and select Restart with Add-ons Disabled.
• In previous Firefox versions, click on the Firefox button at the top left of the Firefox window and click on Help (or click on Help in the Menu bar, if you don't have a Firefox button) then click on Restart with Add-ons Disabled.

If Firefox is not running, you can start Firefox in Safe Mode as follows:

• On Windows: Hold the Shift key when you open the Firefox desktop or Start menu shortcut.
• On Mac: Hold the option key while starting Firefox.
• On Linux: Quit Firefox, go to your Terminal and run firefox -safe-mode
  (you may need to specify the Firefox installation path e.g. /usr/lib/firefox)

When the Firefox Safe Mode window appears, 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 to find the cause.

To exit 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 others with the same problem.

Is it a narrow box with two rows of two characters? Firefox displays that code when it cannot find the corresponding character in any available font. The most common reason to see this is that some sites are now replacing image icons with font characters that Firefox has to download. If you have set Firefox to:

• use only your preferred fonts instead of the page's preferred fonts
• not download fonts (either in about:config or using the NoScript extension)

then you would need to change that in order to see the icons.

First check your font settings here:

"3-bar" menu button (or Tools menu) > Options > Content

Click the Advanced button and make sure there is a check in the box for "Allow pages to choose their own fonts".

If you change that, try reloading the page. Does Firefox load the missing icons?

If that isn't the issue, please post back and we'll move on to the next things.