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There are websites that have video playing back in the backround and removethebackground.com is one of those sites. This kind of effect slows browser's response almost to a crawl unless I switch to another tab.
Here's video: https://www.youtube.com/watch?v=kh3MVX-kdo4&feature=youtu.be
Why in Chrome, IE 11 and Opera it plays fine?
UPDATE: Okay this is weird. I have restarted Firefox in safe-mode with all addons disabled and video was playing smooth. This indicated to me that there was problem with addons and extensions and I disabled them all manually one-by-one after restarting in normal mode. But video was sluggish again despite all addons and extensions I disabled.
This is not clear to me. Are there other things that Firefox not shows me which can be disabled?
Do you have plugins or addin's installed in firefox? If so, disable all and try again. How much RAM and which windows? – Tyson – 2014-07-19T12:24:34.930
Do you have flash player version 14.0.0.145? If not upgrade. – cybernard – 2014-07-19T15:54:09.093
Hey guys. Check for new information added. – Boris_yo – 2014-07-19T17:02:37.530