Start Firefox in Safe Mode {web link} While you are in safe mode; Press the <Alt> or <F10> key to bring up the tool bar. Followed by;

Windows; Tools > Options Linux; Edit > Preferences Mac; application name > Preferences

Then Advanced > General. Look for and turn off Use Hardware Acceleration.

Poke around safe web sites and see if there is still a problem. Then restart

Just got done doing this and unfortunately, FF is still resizing stuff.

Did you test access anything while in safe mode? And it still had problems?

It could be the work of one of your add-ons, or even add / mal-ware. Look thru your add-ons list and make sure you know what each one is there for. Also, check the programs that are on your computer

Windows: Start > Control Panel > Uninstall Programs. Mac: Open the "Applications" folder Linux:

• Ubuntu Unity {web link}
• Xfce: Applications Menu category sections
• options depends on the package manager and the desktop environment

Go thru the list. If you find something that you don't know what it is, use a web search.

Troubleshoot Firefox Issues Caused By Malware {web link}

One way to zoom quickly is to hold down the Ctrl key and scroll the wheel on the mouse. Sometimes it seems that Firefox misreads the keyboard and thinks the Ctrl key is being held down. Stabbing the key vigorously several times often will clear this problem. In other cases, Firefox may occasionally have problems with mouse and keyboard input when wireless input device are very low on battery. In other cases, there may be a problem where some component of Windows responsible for reporting these things to Firefox has crashed or become corrupted, and in those cases, you need to shut down Windows and start it up again.

I know that all sounds random, but...