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Maybe Google's Chrome Android is now allowing back-ground Coin-mining by web-sites. Coin-mining will eat up the idle computing resources of your phone = phone will often lag momentarily.

The Adblock Plus extension in Firefox Android can also block Coin-mining, which you need to add the feature manually, ie by adding a free filter subscription from the Adblock Plus website. Or you can install the No Coin extension in Firefox Android.
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This post has been edited by lurkingaround: Mar 7 2020, 06:48 PM