What are people currently using as browsers on their Jolla phones?

Initially, I used the native browser, and while I found that did the job initially, with recent updates, it's just gotten slower and slower. Now it's at a stage where it's almost unusable, with pages slow to render and very unresponsive when navigating.

This led me into installing Firefox (Android version). This improved things a bit, but I still find that a substantial number of sites (particularly those with lots of Javascript) perform very poorly. The alternative is to use mobile versions of sites, but these fail to even render properly in most cases.

What are others using, any thoughts on hacks or tips to improve things?