Mozilla should not switch the active browser window on you. One example is if you open a link in a new window, but switch to another window immediately after. Mozilla will switch back to that window when you're not expecting. Many other examples. This is especially annoying as you are reading or typing. M14: 2000022820.
This is a duplicate of 28467 which was fixed about 10 days ago. firstname.lastname@example.org, thanks for the testing and bug report but in the future please follow bug reporting guidelines found at http://www.mozilla.org/quality/bug-writing-guidelines.html A clear summary that lables a specific problem as well as clear steps to reproduce will help a bug get confirmed and addressed swiftly. *** This bug has been marked as a duplicate of 28467 ***
verifed dupe of now fixed bug Reporter get latest build and test