Hm, pls. Mod, repost it, as your own;
I duno wanna steal "posting-points"
I use FF 43.0.1. with the latest IHG, incl. adblock plus und noscript; and it works fine;
even when u have 20 open Tabs - much more better, than PM
You only have to change something in the config (FF explain it), from true to false , and u can install ihg - that´s it
(Computer: C1037UN board, incl. XP and FastStoneviewer; So... "few years" old, but still working)