Hi,

I've been playing about with the extension framework - really is a joy
to use.

However I have a slight concern about the threat model. It's fairly
trivial to write an extension to log all form data (from both http and
https sites) and send it off to a foreign host, given content script
and Cross-Origin XHR permissions. The threat model assumes that such
an extension will get bad reviews, so not affect many users, but does
it factor in the autoupdate mechanism?

As a nefarious developer, I could create a perfectly innocent and
useful extension (with content script and Cross-Origin XHR
permissions), and wait until a large number of users have installed
it. Then I release a new version, automatically pushed out to existing
users, that introduces form logging. Whilst it may only take a day or
so for someone to notice and the extension killed, large numbers of
users will have their details (usernames, passwords, credit card
numbers) stolen.

Any thoughts?

Laurence

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