CTRL+H and CTRL+B have stopped working for Firefox. Every other CTRL command works. What's wrong and how do I fix it?

Whenever I want to open my history (CTRL+H) or my bookmarks (CTRL+B), I use those commands. They've always worked. Yesterday, they mysteriously stopped working. Every other CTRL+KEY command still works flawlessly.
I haven't done anything out of the ordinary in the past few days, and I've already tried to restart my computer. What could be the cause of this?
Thanks.

'''Try the Firefox SafeMode''' to see how it works there. 
''A troubleshooting mode, which disables most Add-ons.'' 
[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode#w_safe-mode-window_2 Troubleshoot Firefox issues using Firefox SafeMode]
When in Safe Mode... 
* The status of plug-ins is not affected.
* Custom preferences are not affected.
* All extensions are disabled.
* The default theme is used, without a persona.
* userChrome.css and userContent.css are ignored.
* The default toolbar layout is used.
* The JIT Javascript compiler is disabled.
* Hardware acceleration is disabled.
* You can open the Firefox 15.0+ SafeMode by holding the '''Shft''' key when you use the Firefox desktop or Start menu shortcut.
* Or use the Help menu item, click on '''Restart with Add-ons Disabled...''' while Firefox is running.
''To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before using the Firefox shortcut (without the Shft key) to open it again.''
'''''If it is good in the Firefox SafeMode''''', your problem is probably caused by an extension, and you need to figure out which one. 
http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+themes 
Or it might be caused by Hardware Acceleration.
''When you figure out what is causing that, please let us know. It might help other user's who have that problem.''

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