Merge release branch

[rhelmer]

This updates main to be equivalent to the release branch I've been using to do releases, it:

• bumps the version number
• removes the now-unused CSP from the manifest

[rhelmer]

Thanks, Rob. Looks good to me. I worked out what'll happen with the data depending on when users get the fix, and the tldr is that if they get it before July 1, we're fine, and after that we'll miss some data from up to the first six days of July. (Long version here: https://docs.google.com/spreadsheets/d/1_CE1d-3OJZhYQHf37thuq8Wm7zBQgQJyVlh-iAubNCc/edit?usp=sharing). I understand there's some form of Moz holiday happening, though, so no worries if that isn't possible -- this bug is 100% my bad.

No worries! Thanks for fixing that, it did finally go live on Thu, Jul 22, 5:33 AM :/ Sorry for the extended delay.