This browser is very responsive. But some things never change. Even though it has moved from the old Opera innards to chrome based, the favicons still do not work. They have gotten worse. The only bookmarks that show favicons are non-folder bookmarks on the bookmarks bar. All the others just show a black shadow. If it is a folder the black shadow is in the shape of a folder. If it is a single bookmark the black shadow is in the shape of a page. Vivaldi is the same thing. Really weird.
There is no Xmarks support so I can't even try to upload/download sync it in and see if I get lucky. Dang!
Edit: OK. After deleting all bookmarks and importing from Firefox instead of chrome, when I open all bookmarks in a folder in the bookmarks bar, the favicons fill in. It is a pain to do it manually but I haven't found a "check all bookmarks" type of extension for opera. I'll get there eventually.
Edit2: I missed the obvious. The SlimJet Favicons file was over twice the size of the Opera one. I renamed the Opera one to Favicons.bak and copied the SlimJet Favicons file. Bingo! All filled in.