> Firefox does this pretty bad now. I typically wait a few minutes after opening Firefox before doing anything. After roughly a minute Firefox has autocomplete in the URL bar, but no websites will load until I wait another minute or so.

Wow! I have maybe a dozen extensions installed, but even on my work laptop (which is not very high spec), I can use Firefox easily within 10 seconds of opening it. Do you have tons of tabs open and have it set to reopen the previous session? I'm kind of shocked to hear that it could take this long