it seems not. On the other hand, there is JSON at https://extensions.gnome.org/comments/all/?pk=1206&all=true. So a quick webtask.io task later and I can now see reviews as an RSS feed. Hooray, job done, well done serverless people for making this sort of thing easy and I don't have to run a server.
@sil ooh webtask.io looks worth exploring
@moreati there are a few things doing this free faas idea. GCF, webtask, zeit, bunch of others. Most have invented their own API, but that's reasonable I think
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