Many websites run scripts on your computer that do more than just facilitate viewing the site. That's how those sites make money. They track the user and develop salable user or statistical profiles for commercial outfits and advertisers.
These scripts can be poorly written, or even intentionally intrusive and therfore cause havoc at times, particularly where they conflict with operating systems or even scripts from other sites.
There are anti-script add-ons for browsers like Firefox -- NoScript is the one I use -- and these can be used to warn of scripts or disable them, or enable them on a temporary basis or even enable them permanently on a site by site basis.
Another frequent crasher of browsers is Flash. It's under constant revision and has a bad history of poor and intrusive code. A similar add-on browser solution is Flashblock. Again, it can be tailored to view flash where wanted and blocked where it doesn't play nice.
I find Photobucket needs a fair amount of taming from these security add-ons to make it play nice, and just accept my photos and allow me to generate a link to those photos.
But once tamed, it's very straightforward to use, and pretty quick.
