VivaldiFox per Tim Nguyen

This dynamic theme provides the following features:
- Custom theme creation like in Vivaldi
- Integration with page colours
- Ability to set night theme

Works along:
- Tree Style Tab
- Tab Center Redux with "Integrate with current theme" setting.

Important information
- On Firefox 59 or lower, a text shadow will sometimes appear. This has been fixed in Firefox 60, I recommend upgrading if you're still on an older version, but you can also use userChrome.css to fix this, the code is here.
- This add-on is only focused on providing VivaldiFox style tab coloring. For features like tab stacking, I recommend Tree Style Tab
- Please report issues here

Github: https://github.com/nt1m/vivaldi-fox