I had used Thunderbird's RSS reader for ages, but last year I needed to work on both machines concurrently, so went looking for an alternative and found newsblu

I had used Thunderbird's RSS reader for ages, but last year I needed to work on both machines concurrently, so went looking for an alternative and found newsblur - https://newsblur.com https://newsblur.com is awesome, and works on mobile as well. (unaffiliated, happy paying user. it is free software so you could host it yourself if you want).