* Create background in popup if private mode, remove gates
* Add messaging support to runtime in private mode
* Fix messaging services and general bootstrap logic
* Add private mode warning, remove old component
* Deprecate launchGuardService
* Require in memory account for user to be considered authenticated
* Don't change icon for private mode windows
* Set all icons from background page
- `visibility:hidden` also hides text from assistive technologies, leading to the settings link lacking an accessible name when not hovered (focused with keyboard only, for instance)
- turn the styles around and hide the non-hovered link's span with "visually hidden" styles https://www.a11yproject.com/posts/2013-01-11-how-to-hide-content/
- also include `:focus` to make the text visible when hovered (for sighted keyboard users)
Kyle Spearrin
Thomas Rittson
Oscar Hinton
Patrick H. Lauke
Kyle Spearrin