Java script disabled when using Firefox

[JOE 11]

OS is XP I use Safari and Firefox (35.01)(mainly use FireFox)as browsers Safari java script is working on facebook.However Facebook tells me that the Java script is disabled when using firefox so I cant log in.I have gone to the about config page checking the java script enabled / Its Set at TRUE/ Any latest version of firefox messed my XP OS .I just woke up and turned the computer on tried to log into FB and got this message (using a laptop). I don't remember changing anything.the night before.I also tried to restore to a earlier time that didn't FIX the problem ANY SUGGESTS on how to get Java Script working on firefox

[xilolee]

Firefox 46.0.1 works on xp sp2.
Did you try it?
It seems by the way you need to first install firefox 43.0.1, then install the Windows update KB2763674, then you can install new versions.

And in that kb, Windows xp isn't contemplated.

[JOE 11]

the newer firefoxes like 44 messes up my OS..Fixed finally   
I used a firefox add on. For some reason FB was blacklisted ...don't know why?
https://addons.mozilla.org/en-US/firefox/addon/just-disable-stuff/?src=search

Called >>>>>>>Just Disable Stuff 1.1.1-signed.1-signed  No Restart by Deep Web

Just disable JavaScript - toggle it on and off. No fancy toolbars, icons, windows, unnecessary functions. Just do it. You can also disable images.Just like that.

 

[xilolee]

Glad you solved it.

You can click "mark solved" on your message to inform other users.

I think you know everyone say windows xp shouldn't be used and the same is valid for firefox add-ons, by the way...