I use alexandrite to switch between different lemmy instances and change the default post layout to card style. When I first started using lemmy, the I found the difference between the reddit and lemmy in the post feed to be jarring as I was used to a card style layout.
I find on a desktop browser, I prefer to be able to see images without opening a thread. I initially used kbin.social exclusively for this feature but disliked the way their sorting algorithms are setup. Having the ability to easily switch instances is also a nice feature particularly for new users who are unsure what lemmy instance they want to use.
Also keep a look out for Alexandrite working well on mobile. It’s focus is big screen desktop usage, but the dev is now making it work better on smaller mobile-like screens. It’s already not bad! And improvements should be coming.
I’ve been loving alexandrite since it came out … also check out the Hue option in the settings … really simple way to adjust the theme.
Good chance the Dev will allow you to set a different hue for each account/instance for easy identification … and maybe even provide some more simple theme options.