fix: Firefox settings no longer disabled on the options page when in …

…Firefox (#214)

chore: Bump to 3.7.1 and refactor menu creation IDs

chore: Fix lint failures

Upgrade dev dependencies

Fix typo in CHANGELOG.md

Remove stray console.log

Refactor `legacyDownloadInfo` out from code

Add support for onMessageExternal

Check download origin before suggesting new filename in Chrome

#109

Add link to source code in "Notes for reviewers"