MV3: Sandboxed Iframe breaks interactive elements on some websites

[adomasven]

Report: https://forums.zotero.org/discussion/115357/zotero-connector-conflicts-with-lastpass-in-chrome

We can't fix this bar adding a blacklist where we don't run translation, but to properly address this we need the Chrome to allow userScript API or its equivalent with a permission.

[adomasven]

Another report https://forums.zotero.org/discussion/115227/zotero-connector-libkey-nomad-interference

Redirection via proxy service using the Libkey Nomad extension somehow ends up on zotero connector translate sandbox.

[adomasven]

Chromium issue https://issues.chromium.org/issues/348520452

[adomasven]

Breaks proquest reader https://forums.zotero.org/discussion/117425/epub-and-proquest-ebook-central

[adomasven]

Breaks new UI ebscohost discovery service https://forums.zotero.org/discussion/118171/zotero-connector-ebsco-full-text-finder-issue

We could consider running the translate architecture in an offscreen document, although it might create issues due to undefined lifetime of such documents, so probably only for the detect phase (which would complicate MV3 translation setup even further).