All of a sudden firebug pops open on every page I load, I did a fresh install of firebug but that doesn't help either.

Answers

• In the opened pop-up, select the script tab, click options and uncheck 'Break On All Errors'. (Recommended)
• I also suggest you try resetting the firebug options: Firebug Icon
  Menu (upper left) > Options > Reset All. Firebug 1.4.2 and earlier had
  a bug in activation and some people tried to work around it by using
  Open All options.