ingame browser
 

is it possible to get the in game browser to use firefox addons like Adblock plus or Noscript ?

First off, the in-game browser is based on Firefox 1.5.0.9. The official addon site doesn't support any version below 3.0 and thus the addons do not either. Secondly, the game patcher likes to revert a lot of things that change about the browser, so even if you got an addon to load, the settings would probably get reset and it wouldn't be loaded again.