hdd60311

Seems that drag and drop isn't available now. [Bug 1408756](https://bugzilla.mozilla.org/show_bug.cgi?id=1408756) But found a addon [Swift Selection Search](https://addons.mozilla.org/en-US/firefox/addon/swift-selection-search/) it use ↑/↓ buttons to reorder items, maybe can refer this method? ![qq...

Just saw this in the release notes of [Selection Context Search](https://addons.mozilla.org/firefox/addon/selection-context-search/) **Open the Add-on Options page in a new tab. This will allow to drag-and-drop rows in the table.**

@amccausl support for hiding single tabs is here https://bugzilla.mozilla.org/show_bug.cgi?id=1423725 https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/tabs/hide