Blockers for extended browser support

[conceptualspace]

Safari:

• bookmarks api

Firefox on Android:

• chrome_url_overrides : newtab
• bookmarks api

Edge on Android:

• chrome_url_overrides : newtab
• Issue open here: android support for chrome_url_overrides microsoft/MicrosoftEdge-Extensions#310

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Zen:

• working but requires manually setting the new tab

Opera:

• working but looks best after editing the default new tab page to be blank