Support more firefox variants for incognito link opening

[teknsl]

• firefox-devedition
• firefox-beta
• firefox-nightly
• qutebrowser

[Mm2PL]

I would love for us to find browsers either by URL associations or XDG desktop files. XDG desktop files usually have a new-private-window action. We wouldn't need to explicitly add support for every single web browser on the planet. However that might not be worth the complexity.

That said I'm completely ok accepting this patch.

[Mm2PL]

Please add firefox-developer-edition to the list. And a changelog entry

(I may have misclicked approve before)

[Mm2PL]

This opens a new window, not sure if there is a better version that opens a tab in an existing private window, might be worth noting.

[teknsl]

firefoxes open in an existing window for me but could not find anything to make qutebrowser open in an existing window

[teknsl]

i did not try to build and missed the type std::pair<Qstring, Qstring> (sorry). with this it isnt possible to support browsers that need more than one argument to open in an incognito window like qutebrowser. from what i can tell there is only two places that call/use getPrivateSwitch so maybe it wont be too hard to modify but its out of my ability

however i only added qutebrowser while i was already adding browsers, i do not daily drive this so i will remove it

maybe pr should be renamed to reduce scope?

[Mm2PL]

It's okay to remove qutebrowser. It seems that the private window switch isn't all that good in it anyway.

[Mm2PL]

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