* feat(toolbox) allow any toolbox button to be displayed as main
fixes the previous behaviour where only a certain set of buttons were whitelisted for being displayed in the main toolbar
* code review
* code review - fix avatar icon position
Knowledge is power, man!
The config.js cache predates the feature base/known-domains.
Technically, it's also able to recall more domains that the feature
recent-list can (because the latter limits its entries).