Fix username and photo page

[noamkush]

This fixes 2 issues:

1. Username detection - didn't work for me in the feed (that's the notranslate - in some cases this detected the profile image instead of the name)
2. Photo page didn't work due to multiple issues (presentation article changed to div and in username detection I used main instead)

[noamkush]

@mittya Please release a version for Firefox, I see this is only available for chrome.

[mittya]

@noamkush Now their review system has changed, in about a week or so.