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Re:How Firefox Got Fast Again by aapjesverkoper on Monday November 13, 2017 @11:29AM (#15687639)
Thanks, this seems to work. I found the no-remote option when looking around, but accidentally lauching private_dot_com (nsfw) a couple of times at work instead of my private profile ended my testing with this last time.
Re:How Firefox Got Fast Again by myfonj on Monday November 13, 2017 @12:05PM (#15687928)
Yup,

    c:\apps\firefox\firefox.exe -no-remote -profile "C:\profiles\some-clean-profile"
was my was-to-go method for testing various configurations.

Knowing about

    %USERPROFILE%\AppData\Roaming\Mozilla\Firefox\profiles.ini
is also often helpful, eg. when you want to move certain profile folder.