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How to clear desktop on firefox (using android mobile)?

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I have/had firefox on 3, netbook, laptop. Each show the 3 different versions of Windows NT for the machines in firefox android mobile desktop. Problem is the laptop is broken and hasn't beenused in 1 month (will no longer use it, can't turn it on). How do I not show (or remove) firefox results for the laptop in the desktop tab of android mobile???

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Here's one way to do this:

  1. Open the "Sync" section of the Firefox preferences/options window on your PC.
  2. Press the "Manage account" button and choose "Reset sync"
  3. Choose "Replace all other devices with this computer's data" and press the Next button.
  4. Press the Next button again to confirm your choice.

This will get rid of the old data, including the tabs from your old computers. Warning: This will cause each browser to re-download all of your sync data, which can take a while (especially on a mobile device).