Worked for one day only.

uBlock Origin -> My Filters
anysite.com##+js(aeld, /blur|focus|afterblur|mousemove|visibilitychange/)

I install this add-on only for one thing - to disable auto refreshing Facebook news feed. It work well! But when I found one side effects - you can't make posts on web version of Instagram. Always have a error "Your post could not be shared. Please try again". So sadly I can't use it(

Works. Make sure to toggle it for the sites you need it to work on.

Works great for coursera.org courses on Rhyme

doesn't work

Thanks a LOT

it is greyed out and couldn't use nor pin it

Perfect. Just tried it on localhost and the event for visibilitychange (active) is only fired once during load

YOU MADE MY DAY

love your work. this one hasn't noticeably let me down like the other visibility api spoofers. ~ works perfect on multiple tabs on twitch, & youtube.
(but also need to disable browser-animation throttling in about:config.)

Very useful when deal with net lessons that sucks.

thank you so much! does exactly as intended when i'm downloading multiple custom content for my sims games :]

It actually inverts the issue. Without it, all tabs see themselves is invisible, with it all pages see themselves as visible. Autor recommends to use a separate profile or a Chrome-based browser to not apply the addon on all pages, which resluts in higher power consumption.
(other idea: do not enable this addon for private mode and open tabs that are supposed to be not fake-active in private mode - however this has different side-effects)