Hello,I have a problem when I want to restart my firefox.I press to closed and firefox looks like it closed,and when I try to reopen again it says "you must shut down previous session before a run firefox" It happen with downlods ,too. Today I tried to download a new version,last version of firefox mozilla and when I tried to install it it say because of some crushes you could not properly install new download. Please,is there anyway to help me? All the best Stevan