> I fully expected to find it as a standalone extension, but if it exists, I couldn't find it.
It can be installed from here: https://testpilot.firefox.com/files/[email protected]/la...
(From their GitHub page.[1])
Also note that the Test Pilot page [2] contains a summary of the data they collect. Most notably:
> Side View does not collect any information about sites you visit.
The data is does collect seems related to whether and how you use it - it is an experiment, after all.
[1] By proceeding, you agree to the terms and privacy policies of Test Pilot and the Side View privacy policy.