[Note] This is a follow-up bug for Bug 1334096 [Affected versions]: Firefox 54.0a1 (2017-02-27) [Affected platforms]: Windows 10 64-bit Mac OS X 10.12.1 [Steps to reproduce]: 1.Launch Firefox with clean profile. 2.Create extensions.webextPermissionPrompts and set it to true. 3.Install via sideloading method a webextension with permissions. 4.After reopening the browser, navigate to about:add-ons and click on Add-ons Manager “Enable” button. 5.Click “Cancel” button from permissions doorhanger. [Expected Results]: Sideloading notification from Panel Menu is no longer displayed after canceling the permissions doorhnager. [Actual Results]: - Sideloading notification does not disappear from Panel Menu after canceling the permissions doorhanger. - See attached screencast.

believes this was fixed - andrew checking

Vascilica - can you reproduce this bug in Nightly?

This issue is still reproducible on Firefox 55.0a1 (2017-04-19) and Firefox 54.0a1 (2017-04-18) under Windows 10 64-bit and Ubuntu 16.04 32-bit. Please see attached screencast.