LambdaGen is bugged in FF Mobile. (possibly on other mobile browsers too?) After loading the page, if you go back to the main feed the page constantly sets your scroll position nonstop, preventing you from scrolling, and you need to reload the page. After the multiverse update, the "verse" sidebar is not scrollable, so only the first few are accessible on a phone screen.
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We’re aware of the community selector not scrolling on Firefox - this will be patched. The scrolling issue seems to be specific to Firefox Mobile, which is a browser we have not tested or actively support. We’ll try look in to this but it may take time. Thanks!