So many of the extensions for Firefox that people depend on seem to make up for its shortcomings, based on what others tell me (I don't use it enough to mess with extensions). Neither Chrome nor IE I have ever felt were lacking in a way that an extension could make up for. Chrome's significant issues have to do with UI (particularly the title bar/tabs) and IE's are all at a level that no extension will touch because they are internal. I just look at the stuff that others say they "need" extensions for, and most of it strikes me as the kind of twiddling/tweaking that "power users" enjoy, not because it delivers meaningful/measurable productivity gains, but because they are convinced that a system should work "just so".
By the by, those are the same users that I think the desktop model caters to quite well, but is hurting the other 95%+ of users out there who could not care less about tweaks, and when they do tweak, they also break. I may note, the same seems to happen with browser extensions...
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