Currently the reload button is disabled for 650ms right after it appears to prevent accidentally reloading a page when the users tried to stop loading a page that finished loading at the exact same time.

Comment on attachment 8881920 [details] Bug 1376893 - Don't display the disabled reload button with less opacity since it is only disabled temporarily and causes flickering in the UI. Thanks for the patch! Looks reasonable to me, but I don't have time to review all the other existing CSS rules applying to #reload-button, so forwarding the request to Johann.

Comment on attachment 8881920 [details] Bug 1376893 - Don't display the disabled reload button with less opacity since it is only disabled temporarily and causes flickering in the UI. https://reviewboard.mozilla.org/r/152986/#review158712 Seems good now, thanks!

Pushed by jwein@mozilla.com: https://hg.mozilla.org/integration/autoland/rev/8a71fc08867b Don't display the disabled reload button with less opacity since it is only disabled temporarily and causes flickering in the UI. r=johannh