View Sources in Tabs

Firefox opens page sources and selection sources in new windows instead of a tab which would make more sense in my opinion. If you do like to change the default behavior and open all sources in tabs instead of new windows you should install the Firefox extension Source Viewer Tab.

Another nice feature of this extension is that you can open the source tabs again by selecting undo close tab which would not be possible if the sources would be opened in a new window.

Useful for webmasters and developers.