Lol .. I tell you Maxthon is much better in terms that FireFox crashes a lot and have rendering problems with many sites .. Most of what Firefox gives you with the additions of extensions is built in Maxthon ... I use only 4 plugins and I dont need anything else...
Yes .. Maxthon is pretty fast from 1.x builds .. I earlier used Opera for Digit forums because its a bit slower but now I use Maxthon for it too .. I dont have Opera installed

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Biplav SpywareBlaster dont need to run in background everytime.. It justs blacklists CLSIDs of rogue softwares and wont let them install .. It also put lots of sites known to put malwares on your computer in the blacklisted sites so they wont open even somehow a link redirects you to them .. But these lists are updated regularly .. so you need to update your program definitions too ..
I have nothing against FireFox ..Its just its a PIA when it crashes taking all of your new posts .. And yeah ..It eats hell lotta resources ..