I've figured out that on firefox-esr it works out of the box, on the newest firefox it may need some tuning.
If it doesn't work, one can try to open "about:config" in a new tab, then "accept the risks", then search for "chromeaccess" - only one entry should remain. double-click that entry and set it to 18. Then Alt+Shift+key should work -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to tiddlywiki+unsubscr...@googlegroups.com. To post to this group, send email to tiddlywiki@googlegroups.com. Visit this group at https://groups.google.com/group/tiddlywiki. To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/f28589a6-4e4d-4afe-ad02-157d1fe6c1af%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.