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add-ons do not open

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I have tried several times to add an ad blocker such as uBlock or Ghostery to Firefox for Android through the Firefox add-on mobile site. However, the add-ons will not launch when I try to launch them. Any help will be appreciated.

I have enabled permissions for Firefox through App Settings.

I have tried several times to add an ad blocker such as uBlock or Ghostery to Firefox for Android through the Firefox add-on mobile site. However, the add-ons will not launch when I try to launch them. Any help will be appreciated. I have enabled permissions for Firefox through App Settings.

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additional information: Firefox v 56 Android v 6.0.1 Samsung Galaxy S5