A few weeks ago I was one of Mozilla's biggest fans but since I tried the last version of Opera I'm thinking of giving up the old firefox...
I installed an addon for the fox with some themes and another plug-in that automatically loads the next page that worked good at the time but after a while mozilla started going really slow , using 50% of my processor (which is 100% of one of my Core's) and sometimes more then 800 MB of RAM .. at least that's what the Windows Processes Menu showed me , the only solution was to delete the proces and start the firefox again.. which was annoying considering that it could force me to close while in the middle of some important work.
I tried reinstalling it but it was useless..same problems. After a little research on the web I found a little trick using Mozila Firefox Profile Manager.. if you'll google it you'll find more about this.... it practically succedes where Reinstalling the whole application fails.
Even so , after changing profile , at least in my case..I still felt like it was time for a change.
I gave Google Chrome a chance and it actually wasn't that bad ... but still not impressive. Now , after trying Opera everything changed , everything loads so fast and surfing the net is so smooth , no excesive RAM used , also the procesor doesn't go over 25-30%.. so one word , EXCELENT.
For me now this is how things look like
Before this I've used Firefox for more then 2,3 years without any complains. Maybe in time after a few updates I'll go back to give it another chance , but this time with no themes , or useless plug-ins and addons which the net is full of considering this browser is Open Source.. so everyone cand publish diferent stuff for it.