Adventures in @thunderbird add-on development.
Motivated by a thread I seen yesterday, I decided to create a #WebExtension that would display pkpass files as inline attachments.
I managed to get all the data from the pkpass files and process them, what is giving me trouble is actually getting a `document` that is not attached to a `window` to work with html2canvas.
Like how to screenshot a document which only exists in memory?
Any clue? anyone?
