I've got a problem downloading a suitable version of Firefox for Linux, to run on a Knoppix Live DVD system, for use in testing publishable extensions that I've developed on Windows. (This is not an extension development question, however, just a problem downloading and configuring FF suitably.) I was surprised that the current version (FF40) and earlier (FF34) for Linux come with 3 extensions permanently installed - Adblock Plus, FoxyProxy Standard, and NoScript. They apparently cannot be uninstalled, although they can be disabled. I've read online in various forums that Adblock Plus is a memory hog, and that it, especially, as well as NoScript, can interefere with legitimate code on websites and extensions. I've also read complaints from users that disabling Adblock Plus does not seem to remove all its effects. During my testing I experienced problems that I suspected were due to Adblock Plus, so I disabled it and restarted the browser. The situation greatly improved, but there were still a few problems that might or might not have been related to memory shortages. The issue is this: I would like to download "clean" versions of FF for Linux without these 3rd party extensions installed, to achieve more conclusive testing, but have not found a way to do it. I'm also curious as to why these extensions are being "forced" on Linux users. (I hope that never happens on Windows, or I might become a less committed FF user.)