Reset remembered firefox canvas decisions

You can find the permissions.sqlite sqlite database in your Mozilla profile folder, and then proceed to

SELECT * FROM moz_perms WHERE type = 'canvas/extractData';

From there you can decide which rows to keep or to delete with simple SQL delete statements, such as

DELETE FROM moz_perms WHERE type = 'canvas/extractData' AND origin = '<YOURSITEHERE>'

or of course via its id

DELETE FROM moz_perms WHERE type = 'canvas/extractData' AND id = <YOURID>

Please be careful when manipulating Firefox data, and be sure to backup your profile first.

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