Starting with Firefox 29.0, Mozilla made a terrible design decision by removing the add-on bar...
Imagine you just spent about 60 bucks on a computer game. Imagine said game kept crashing seemingly randomly without any sign of warning with a generic error message such as "Grand Theft Auto V has stopped working".
Now imagine you were presented with dozens of search results on Google with seemingly helpful "tips" what might cause it and how people managed to fix it. Sadly, those tips mostly read like this:
GTA V used to crash for me all the time. Then I fed my cat and it never crashed since then. So I suggest you all get a cat and feed it.
Unsurprisingly - even though cats can be evil - they are not responsible for GTA 5 or GTA online crashing.
There are many reasons why GTA might crash, but the most common one seems to be a known bug affecting aiming from inside a vehicle like a car, airplane, helicopter, boat, motorcycle or whatever. It seems to occur whenever you were using some sort of explosives earlier, like sticky bombs or any type of grenade.
People keep suggesting stupid "fixes" like re-installing Windows, un-installing third party software, disabling anti virus software or even tampering with game files.
Don't do that. It won't help.
While keeping your system clean is generally a good idea, it's up to Rockstar Games to fix this issue since it's clearly a bug within their game.
The most sane approach at the time of writing is to avoid the issue by NOT using explosives until the game was patched to fix the problem.
And PLEASE do not infect the Internet with more nonsense suggestions like "I did something completely unrelated and it fixed it for me." You are NOT helping.