From <https://github.com/gomita/tabscope/issues/65#issuecomment-328731138>: Mozilla bug [1385453 - Make it possible for async tab switcher to "warm up" tabs that are likely to be displayed soon - bugzilla.mozilla.org](https://bugzilla.mozilla.org/show_bug.cgi?id=1385453) - RESOLVED FIXED in Firefox 57 - referred from [Photon Engineering Newsletter #15 | Dolske's blog - dolske.wordpress.com](https://dolske.wordpress.com/2017/09/11/photon-engineering-newsletter-15/) (2017-09-11). Might 1385453 help to allow previewing of tabs that have not been clicked? (Is the Firefox Quantum phrase 'discarded'? I lose track.)
From gomita/tabscope#65 (comment):
Mozilla bug 1385453 - Make it possible for async tab switcher to "warm up" tabs that are likely to be displayed soon - bugzilla.mozilla.org
Might 1385453 help to allow previewing of tabs that have not been clicked?
(Is the Firefox Quantum phrase 'discarded'? I lose track.)