don't want to save file to open it
open a file, it is saved. save file, it is saved. what's different? My downloads folder is so fucking dirty. Developer, are you kidding me?
Solution choisie
Firefox always need to download a file to be able to view it locally.
You can set browser.download.start_downloads_in_tmp_dir => true on the about:config page to make Firefox use the OS temp folder for downloads you open in an external application.
You can open the about:config page via the location/address bar. On the warning page, you can click "Accept the Risk and Continue" to open about:config.
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You'll need to be a bit more specific. What file types/dot extensions are you trying to open? And it looks like you're using Windows 10, right? Sometimes there could be a workaround.
Solution choisie
Firefox always need to download a file to be able to view it locally.
You can set browser.download.start_downloads_in_tmp_dir => true on the about:config page to make Firefox use the OS temp folder for downloads you open in an external application.
You can open the about:config page via the location/address bar. On the warning page, you can click "Accept the Risk and Continue" to open about:config.
What if that .exe you are trying to run without scanning it is a Iamreallyatrojan.exe unless you know it is a safe source.