I found this great extension that blocks scripts on sites. when it blocks something, a yellow bar appears + it makes a sound when it blocks. you can disable the sound if you want to. when it blocks and you want to allow scripts for that site, you can just left click on the yellow bar or the blue/white S icon at the bottom right on the FF window and choose allow. After you have done this to site you often goes to , you can even disable the yellow bar if you want. anyway, there are a few more settings which you guys can check out for yourself, here is the link to the extension =
https://addons.mozilla.org/extensions/moreinfo.php?application=firefox&category=Newest&numpg=10&id=722