If you open a file that's already saved Firefox ask again if open it or save it, and if it's not listed on Applications list it keep asking it. Moreover, every time you click Open it will always ask it when it's reopened on another tab, quite annoying. And then the file that you opened doesn't even appear on the Applications list to choose the main action to it when detected. Every time I open a file not included on the list I click to open it but then when it reopen it on a new tab it ask the same so it's endless, and asking to save it is worthless as it's already saved, not so smart. Would be great to click Open an Firefox simply open that file.