I have found trackers in the addons “Screengrab!” and “S3.Google Translator”:
The addon “S3.Google translator” (at least version 5.35) and “Screengrab (fix
version)” (at least version 0.99.12) do contain a tracker. I tested with tis versions because I use Pale Moon browser, and not all Firefox addon (versions) are compatible with Pale Moon. But since it is a tracker I suspect it to be also in later versions and successor addons.
I report it here, to raise awareness for the responsible people so that they can investigate and take measures.
Here is what I observed:
When one of the addons is enabled, whenever I visit a new domain in a new tab (or revisit an
old one after some longer time), this is logged to crvtck.com, possibly
containing other data:
I see HTTP requests going out to URLs of the form
<key> is a hex string with 32 characters.