Years ago Opera Presto, then later Vivaldi, switched me onto the substantial browser usability improvements from a dedicated second sidebar incorporating customisable #WebPanels. Sadly, eventually, it became too hard to keep faith with the Vivaldi project for numerous design reasons. #FirefoxNightly  with #Sidebery became my new home instead, despite lacking that extra sidebar. Much more recently, #Floorp  crossed my radar, replete with a Vivaldi-esque WP sidebar, & i was smitten. It does, however, have some issues i dislike, but i tolerated them for the overall good. Then #ZenBrowser  arrived, & i had a new love, albeit its unusual WP implementation is less convenient than it should be. Atm both  &  seem to be heading in design directions less attractive to me, so the age-old quandary continued. Then, a few days ago, i serendipitously stumbled onto this fab project https://github.com/aminought/firefox-second-sidebar, & now i'm as happy as a porcine creature in biological byproduct...  with a dedicated second sidebar incorporating customisable #WebPanels. 🎉 🥳 👯‍♀️