Thanks for the feedback. This addon was meant as a drop-in replacement for my other addon "Load Background tabs on select" which could not work on android since firefox is missing the essential tab.discard function there.

The automatic loading on switching focus works as long as the app is not closed/suspended and its memory released and the reload does not work because canceling request leave the tabs in an unreloadable state. Funny enough this doenst prevent the addressbar from getting the URL and commit/enter to still work. But there is not much i can do about that since its firefox internal behaviour i cant influence/change.

In case you are adventurous,
a fellow addon developer tried his hand at a version which tries to fix some of these issues: https://github.com/eight04/load-background-tabs-on-select/tree/dev-webrequest

The modifications basically keep the request waiting forever and from eight04's tests it looks like there are no immediate drawbacks and reload and switch works as expected, but i did not feel comfortable with this method since i suspected that leaving requests open would still draw resources so i decided to stick with the canceling of the request since i was sure that would not cause any extra resources to be used up.

The options are reallly not very mobile friendly ... as i said this addon hasn't gotton much love for a while ... but i might have to come back to it and see if there are new ways to improve stuff. ... mobile development just isnt exactly my speciality so yeah ... dont hold your breath.