Hello, When I'm opening an PDF file in a firefox tab, which is not a big problem (even though it could be faster... how?)... the big problem comes when I try to close the tab with the PDF, or when I want to go back ("back" button) : Firefox frozes for some seconds or minutes (depending on how big is the PDF) before closing the PDF. I find it very annoying because I open quite often PDF files and this problem makes the navigation very slow... Thanks for all your suggestions to cope with that ! Thomas