it also really helped that in difference to today wen Chrome was new it's performance gain over FF was often quite significant (same for security)
while that isn't really true anymore in any relevant way it's still stuck that way in many peoples heads
And sure part of the perf issues where quite often not well behaving FF extensions, toolbars etc. also often installed by unrelated programs preexisting installed on the same computer and that FF needed some major refactoring/rewriting just because it was quite a bit older (which are done by now but had inevitable but sad effects like XUL extensions being gone).
while that isn't really true anymore in any relevant way it's still stuck that way in many peoples heads
And sure part of the perf issues where quite often not well behaving FF extensions, toolbars etc. also often installed by unrelated programs preexisting installed on the same computer and that FF needed some major refactoring/rewriting just because it was quite a bit older (which are done by now but had inevitable but sad effects like XUL extensions being gone).