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if you haven't received anything, go to Settings/Sync and resend the verification code.

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it looks like you're trying to sign in to sync from an android firefox instance. we're very sorry, but this is going to hurt a bit.

to sign in you'll need to follow these steps:

  1. enable USB debugging in the android:
    1. go to setting → about phone
    2. scroll to the build number
    3. tap it until a "your are new a developer" message appears
    4. go to settings → system → developer options
    5. scroll down to "USB debugging", enable it
  2. enable USB debugging in the android firefox settings
  3. connect your android device to a PC for USB debugging
  4. on this PC, open firefox and go to 
    about:debugging
  5. enable USB devices
  6. connect to your android device
  7. open this page in a normal tab, not through the sign-in interface. this is very important, if there's no normal tab with this URL open signin will not work
  8. open the login page through the sign-in interface as well
  9. in the PC debugger, inspect the new tab that has just appeared
  10. actually sign in. clicking this link will lead away from this page, finishing sign-in will bring you back.
  11. go to the javascript debug console of the tab we inspected previously, copy the long block of code
  12. locate the 
    Firefox Accounts WebChannel
    extension in the debugger and inspect it. this may fail, if it does go to the setup tab of the debugger and disable USB devices, enable then, reconnect to your devices, and repeat this step

    WARNING: this is known to not work on firefox 102. if you get a blank tab instead of a tab with debug tools as seen earlier you may have to downgrade your android firefox to 101 to log in. unfortunately this seems to require uninstalling and reinstalling firefox, which wipes your data!

  13. go to the javascript debug console, paste the block of code, and run it
  14. enjoy sync!