Some webpages insist on using Javascript to resize or displace your Firefox window. A trip to the options menu in Firefox will fix that: Head to Tools → Options.
Click Content, then next to the Enable Javascript, click Advanced.
Uncheck what you don’t want Javascript to do.
I'm Jason, the main author of Third Error, and many of the topics I'll focus on concern Windows (and applicable software), web applications, web design, and a bit of *nix (Ubuntu mainly). My computer runs Windows XP, with virtualized Ubuntu and OS X handy.
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