My firefox crashes withou displaying a crash message, freezes and does not respond majority of the time. what is wrong and what do i do?

Question

When i start Firefox it either
1) crashes, no crash message displayed. just closes as if nothing happened.
2) freezes, doesn't respond to anything and i have to "kill" it with task manager because if it froze and i try to click elsewhere like to show desktop or on another task it freezes the entire computer. It freezes in 3 ways:
1) is when i just opened it and it freezes immediately
2) when i click on it, or start typing some address into the bar
3) when i press enter after I've typed the URL in the address bar.
my Firefox doesn't have any add-ons, or anything else. i already re-installed it 2 times, cleared cache, history, reset all settings. still crashes

Answer 1

Try to disable hardware acceleration in Firefox.
*Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
*https://hacks.mozilla.org/2010/09/hardware-acceleration/
Try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.