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The portable builds are fully portable, the profile directory is inside the browser folder. It does not touch appdata at all.
Notable bugs:
The 32 bit build is built with --disable-sandbox. With the sandbox enabled under Vista, the browser fails to open multiple processes which breaks the browser. The 64 bit build is fine. Considering Mypal68 globally disables the sandbox, I don't think it's that bad. If this really is a big issue then please pr a fix.
Major fixes:
Caption buttons now show with a lightweight theme installed and GPU acceleration enabled. So far I've been unable to fix this in 136, so it's only fixed in 128 for now. #140
Changes ported over from later releases:
Ability to disable CSP and HSTS now in preferences.
Added routenote.com to useragent overrides list.
Improved about:config
Reworded e10s setting.
Haven't extensively stability tested.
Please let me know what bugs or issues you encounter with it.