https://support.mozilla.org/en-US/products/firefox
https://support.mozilla.org/en-US/kb/customize-firefox-controls-buttons-and-toolbars?utm_source=firefox-browser&utm_medium=default-bookmarks&utm_campaign=customize
https://www.mozilla.org/en-US/contribute/
https://www.mozilla.org/en-US/about/
https://www.mozilla.org/en-US/firefox/central/