Lots of great feedback. I'll try to address each:

• I tried to differentiate voting vs. "like/dislike" for the algorithm as to not confuse users who think they are logged in. I can put more thought into how to make this a bit more intuitive
• Quiblr is built as a progress web app (PWA) so it uses native app components. The benefit is that it is faster and easier to manage multiple code bases. But the con is that it doesn't have all the same benefits as HTML. I added an "open posts in new tab" feature in the settings
• I like the idea of added more body text in the post itself. My fear was that it would make the feed look too crowded, but I can take second look at it
• I love the tooltips idea
• The 3 dot ellipses has a Post Detail section for each post. Maybe this could be a good place to add the link back to the original Instance url.
• I like the scrollbar idea. I think this could make sense as an optional setting because I personally don't prefer the scroll bar but I want to include it for users who do prefer it
• I added a refresh button for users using the PWA version (since they don't have a refresh button in the browser). Maybe something like "pull down to refresh" could work on
• You should be able to press the "<" back button when viewing a community on mobile or just back in your browser. Both should take you back to your feed. Let me know if it isn't working as intended
• I'll have to see the API allows for removing downvoted items from feeds. I can try to get creative if needed

Edit: Added tooltips for post buttons + original url on the Post Detail page. I will continue to update this comment as I work through other additions in this list