Every time I open Firefox, I get several javascript errors that a "script has become slow or unresponsive" referencing line 641 of file nsBlockListService.js. I took a look at the file and it looks like this javascript is trying to do some kind of online lookup at startup. I've tried disabling the blocklist in about:config as well as renaming "blocklist.xml" (suggestion from an online search) but nothing has worked. In my opinion, it is extremely bad design to make an online lookup a startup dependency - Firefox takes well over 5 minutes to load and will sometimes hang - I am thinking of switching to Opera - programs that cannot even start are lame IMHO. I am not the only one experiencing this issue - why is there no posted fix? Why is Firefox even trying to do "anti-phishing/anti-malware" when my antivirus already does it for me? It seems to me it is just another way for Google to gather data about browsing habits. Tying the use of client software to any sort of online server is bad design and unstable in the long term since there is no way of knowing how long the server will be available. Firefox's startup sequence should run independent of any third-party services. It doesn't make sense to force every user of Firefox to wait 5 minutes every time they open the browser, just to perform some sort of "blocklist check". The last time I took a look at the list of blocked servers, ther were only about 20 on there. What a waste of time! How can this check be disabled? == This happened == Every time Firefox opened == I upgraded to Firefox 3.6