Mullvad Browser Extension updated to 0.9.3

FYI Mullvad Browser Extension has been updated to 0.9.3.

See: https://github.com/mullvad/browser-extension/releases/tag/v0.9.3-firefox-beta

In case this helps,also note that the .xpi file in https://cdn.mullvad.net/browser-extension/latest/ will always contain the latest version. (If we can modify something to make your life easier, feel free to ask)