Add Firefox extension, Mattermost plugin, downloads page, and CI release workflow#2

voxsar with Copilot wants to merge 2 commits into

mainsahanRanasingha/TrustVault:mainfrom

copilot/add-firefox-addon-supportsahanRanasingha/TrustVault:copilot/add-firefox-addon-supportCopy head branch name to clipboard