Theoretically we already have this control. "I believe I have the right to control when and for what purpose the computer and software that I own communicates with third parties." I've found this handy to do if you occasionally mess with various Fx versions and want to be sure you will not unintentionally load "nightly" profile with "stable" executable. There is also checkbox "Use selected profile without asking" that when unchecked presumably adds (Update) And one more thing: when using Profile Manager there is a nifty "Work offline" checkbox in there. (I have a super murky memory it might be me who added it there, but today I had to find SU answer mentioning it to even try that) I have not run any network traffic audit so I cannot verify it really does not attempt to reach for something outside localhost. I remember that nearly no webpage worked well in offline mode few years back.) (Again, I'm not sure it used to be this way in the past. Interesting is that even the hard refresh of cached page gives you cached version in offline mode. Also browsing properly cached pages seems to work super well not sure it is due service workers finally caught up and works or proper HTTP headers are used nowadays. From what I've tried now, offline mode lets you browse localhost, what seems super useful but I don't recall it have always been this way.ģ. It used to be mentioned at MDN page but that is gone now.Ģ. It is not even exposed in `firefox -help | more`. it is quite undocumented, but works from what I've tried. The `-offline` argument is quite strange for a several reasons:ġ. For testing it with throwaway profile you can do:
#Bookmark duplicate detector firefox 40 update
I understand your intention is to launch "cold" Firefox instance that does not call home, update the "safe browsing" databases etc, so this will probably not be of any help, but you may try launching it with `-offline` command line argument and uncheck the (alt) "Menu > File > Work Offline" when you are ready to "reveal yourself".
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