- Fix a sync-related permission annoyance.

Before this release, we used `optional_host_permissions`, which does not allow browsers to sync
permissions granted to individual browser instances. This in some sense defeats the purposes of
this extension because this extension won't be activated on the required URLs. Using
`host_permissions` should be OK because security/privacy-aware users can change what sites are
allowed in extension details page.

- Stop minifying the package for better transparency of what is being executed in browser.