Firefox Plus (Tested on Windows only)

Rounded Corners

Sidebar Support

How to install

Go to about:support and click the "Open Folder/Show in Finder" button for the root directory of your browser profile/s.
Download and copy the chrome folder and user.js into the profile folder.
Restart firefox.

Tweaks

To enable macOS button style, open user.js and find fp.tweak.macos-button and set it to true.
To disable bookmarks autohide open user.js and find fp.tweak.autohide-bookmarks and set it to false.
To enable or disable rounded corners, open user.js and find fp.tweak.rounded-corners and set it to true or false.
To enable support for sidebar open user.js and find fp.tweak.sidebar-enabled and set it to true or false.

Note

To get sidebar support you will need to install extension Sidebar Tabs

Enjoy your enhanced browsing experience!