I use Opera 87.0.4390.25 (just released. Opera 86.x from a week or two has the same issue). I cannot join Tib 36 or Tib 52. Edge 101.0.1210.47 works ok. I disabled extensions.
Firestorm 7, 11 are ok. Tib 40 and 49 are ok.
Below is from the dev console on the ones that don't work. The AudioContext message happens on all worlds.
VM17844:541768 The AudioContext was not allowed to start. It must be resumed (or created) after a user gesture on the page. https://goo.gl/7K7WLu
main @ VM17844:541768
ready @ VM17844:535629
eval @ VM17844:534572
true @ VM17844:534595
eval @ VM17844:534572
dispatchEvent @ VM17844:534570
dispatchEvent @ VM17844:532897
eval @ VM17844:532932
true @ VM17844:534595
fireEvent @ VM17844:532932
__eo @ VM17844:535648
onScriptLoaded @ VM17844:535639
qx.$$loader.signalStartup @ VM17844:530617
qx.$$loader.initUris @ VM17844:530647
qx.$$loader.init @ VM17844:530637
eval @ VM17844:556507
(anonymous) @ index.aspx?langPreferred=en_US:512
load (async)
loader.xhrDownload @ index.aspx?langPreferred=en_US:509
loader.startDownload @ index.aspx?langPreferred=en_US:472
window.onload @ index.aspx?langPreferred=en_US:740
load (async)
(anonymous) @ index.aspx?langPreferred=en_US:627
VM17844:532471 Uncaught (in promise) Error: No such property: Mode
at cC.set (eval at
(index.aspx?langPreferred=en_US:293:9), :532471:8)
at cC.checkBrowserSupport (eval at (index.aspx?langPreferred=en_US:293:9), :541833:43)
at cC.checkWarningScreen (eval at (index.aspx?langPreferred=en_US:293:9), :541830:37)
at cC.loadLocaDone (eval at (index.aspx?langPreferred=en_US:293:9), :541797:69)
at construct.C (eval at (index.aspx?langPreferred=en_US:293:9), :551868:4)
at Array.eval (eval at (index.aspx?langPreferred=en_US:293:9), :552014:118)
at construct.notifyPartResult (eval at (index.aspx?langPreferred=en_US:293:9), :551883:120)
at construct._markAsCompleted (eval at (index.aspx?langPreferred=en_US:293:9), :552016:63)
at construct.__ben (eval at (index.aspx?langPreferred=en_US:293:9), :552042:7)
at construct.load (eval at (index.aspx?langPreferred=en_US:293:9), :552039:25)
at construct.require (eval at (index.aspx?langPreferred=en_US:293:9), :551870:36)
at cC.require (eval at (index.aspx?langPreferred=en_US:293:9), :551839:52)
at Function.require (eval at (index.aspx?langPreferred=en_US:293:9), :551838:102)
at cC.loadLoca (eval at (index.aspx?langPreferred=en_US:293:9), :541796:23)
at cC.initUI (eval at (index.aspx?langPreferred=en_US:293:9), :541778:573)
at Object.active (eval at (index.aspx?langPreferred=en_US:293:9), :541775:128)
set @ VM17844:532471
checkBrowserSupport @ VM17844:541833
checkWarningScreen @ VM17844:541830
loadLocaDone @ VM17844:541797
C @ VM17844:551868
eval @ VM17844:552014
notifyPartResult @ VM17844:551883
_markAsCompleted @ VM17844:552016
__ben @ VM17844:552042
load @ VM17844:552039
require @ VM17844:551870
require @ VM17844:551839
require @ VM17844:551838
loadLoca @ VM17844:541796
initUI @ VM17844:541778
active @ VM17844:541775
L @ webfont.js:21
oa @ webfont.js:24
W.g @ webfont.js:23
(anonymous) @ webfont.js:21
Promise.then (async)
Q.start @ webfont.js:21
(anonymous) @ webfont.js:26
setTimeout (async)
ra @ webfont.js:25
(anonymous) @ webfont.js:26
(anonymous) @ webfont.js:33
E @ webfont.js:20
(anonymous) @ webfont.js:20
d @ webfont.js:19
A.b.onload @ webfont.js:19
load (async)
A @ webfont.js:19
Fa.load @ webfont.js:33
qa @ webfont.js:26
pa.load @ webfont.js:24
(anonymous) @ webfont.js:33
(anonymous) @ webfont.js:33