opening preferences or find window pops up a error message like: XML Parsing Error: undefined entity Location: chrome://browser/content/pref/pref.xul Line Number 10, Column 16: title="&prefWindowUnix.title;" -------^ Reproducible: Always Steps to Reproduce: 1. start firefox 2. edit -> preferences 3. Actual Results: error message pops up Expected Results: firefox should work as expected.
Had to reboot and now this error is gone *strange* sorry to waste your time :(