A minor idea…
It would be nice for me if the app(Workspaces/study creation/progress) business end part of the site at app.prolific.co have a slightly different favicon (? is that the term, as shown on browser tabs) to the information end part of the site i.e. Researcher Help Centre researcher-help.prolific.co and community.prolific.co since I often have a lot of help stuff and community pages open but want to get back to the app.
A little yellow dot on the information pages would do it, like the tabs on the right of the screenshot below.
But perhaps this a feature that would only be useful to me since I often have a lot of community pages and faq pages open.