Can you get the flag from this browser extension?

Challenge Information

This is a convenient extension, storing the logins you use on various webpages and offering them to you on next visit so that you don't have to retype. It also doubles as a flag storage, websites cannot possibly get the flag out. Don't believe me? See for yourself!

Note on trying out the browser extension: Unpack the linked ZIP file to a directory. To load this directory as an extension:

In Chrome: Go to chrome://extensions/, enable Developer mode, click "Load unpacked" and select the directory.

In Firefox: Go to about:debugging, click "Load Temporary Add-on" and select any file in the directory.

Challenge Solutions

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