Hi Arnold_Rac,

Please create an issue here so that I can ensure that the issues you're facing can be resolved. https://github.com/sereneblue/chameleon/issues

Depending on the settings you enable, Chameleon will break things. I can try to resolve some issues but I need to know more information (like your settings).

1. This may be caused by a number of settings.
2. Can you list the URLs timezone spoofing is not working for you? I'd need to know your settings to help fix the issue with tutanota.
3. Chameleon allows you to conveniently manage some Firefox preferences like the cookie options. It preserves your existing settings so this should not cause issues. There was a bug in v0.20.0 for the cookie options that caused the settings to be reset, but that has been fixed.