Firefox is slow. In fact, it gets very slow the longer it is kept running. If you are web developer like me, who relies on Firefox for better productivity through its excellent add-ons, such as Firebug, then you must be feeling frustrated with the slow (sometimes extremely slow) performance of Firefox 4 (and/or previous versions as well). Browser speed is of course relative: I am comparing Firefox to Chrome in this case.
Turns out that Firefox is not the only one to blame; there are a host of add-ons that render Firefox to a sluggish speed, both at boot and operating times.