3.1.0

Commits

• a0dafdd: add signed addons for libgen & searchfox engines. (aminomancer)
• c9d4fdd: update readme (aminomancer)
• ce900b8: add new "Invert Element" extension to the repo. (aminomancer)
• 14a0e01: support SF Arabic font. (aminomancer)
• 0a12381: update downloads delete file command to 1.0.2 (aminomancer)
• be04842: fix autocomplete popup items' padding (aminomancer)
• 3847856: update readme (aminomancer)
• 2f57fdb: format all the stylesheets. (aminomancer)
• 6f4ca90: 3.1.0: major update for addon themes. (aminomancer)