I don't suppose many people have this problem, but here goes. Let's say I'm editing some WordPress theme files, and decide to switch the tabs to look at some reference material (I do this a lot since I need lots of help with coding). As you know, in Firefox the keyboard shortcut for that is CTRL+Tab. However, it also activates the tab in WordPress editor. In the best case it just makes a tab space somewhere, in the worst it deletes a small bit of code that was selected, and if I don't notice that, I have to look all over the place when things stop working.
A really small and obscure problem, but it has proven to be quite annoying to me at times :) I don't suppose it's possible to prevent CTRL+Tab from triggering the editor thingy?