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Enormous data usage at background

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While I was sleeping, my telephone finished all of my internet data limit. Then it passed to extra tariff and finished it too. I controlled which program is finished that data. It is firefox and finished all these data in background. There are no video, no music, nothing which can consume this enormous data is open at tabs. I'm using smart phones for years, and it is the first time that happen to me. Now I have no internet for the next 25 days :) What can be the solution for this, and whom fault it is?

While I was sleeping, my telephone finished all of my internet data limit. Then it passed to extra tariff and finished it too. I controlled which program is finished that data. It is firefox and finished all these data in background. There are no video, no music, nothing which can consume this enormous data is open at tabs. I'm using smart phones for years, and it is the first time that happen to me. Now I have no internet for the next 25 days :) What can be the solution for this, and whom fault it is?
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Hi

Did you have Firefox for Android open in the background? If it was and there was some kind of video or other rich media on the page, if might explain the data usage.

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Thank you for reply but as I said there is no video open.

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There are some explanations in this bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1273552

You have to install the uBlock Origin addon and turn off Android phone Settings > Apps > Firefox > Mobile data > Allow background data usage.