no prettygcode for chromium

[tx0h]

hello,

can't get prettygcode running with chromium Version 87.0.4280.88.

octoprint is 1.6.0, prettygcode is 1.2.4, python is 3.7.3 on octopi 0.18.0.

that's what i catch from the inspector console:

Create PrettyGCode View Model
packed_core.js?40786308:1223 Starting dependency resolution...
packed_core.js?40786308:1236 ... dependency resolution done
packed_core.js?40786308:1259 Initial application setup done, connecting to server...
packed_core.js?40786308:1062 Connected to the server
packed_core.js?40786308:1067 Triggering connect on all view models
packed_core.js?40786308:1069 Server (re)connect processed
packed_core.js?40786308:1259 Finalizing application startup
packed_core.js?40786308:1240 Going to bind 42 view models...
packed_core.js?40786308:1252 Did not bind view model TimelapseViewModel to target #timelapse since it does not exist
packed_core.js?40786308:1252 Did not bind view model TimelapseViewModel to target #timelapse_link since it does not exist
packed_core.js?40786308:1252 Did not bind view model BackupViewModel to target #wizard_plugin_backup since it does not exist
packed_core.js?40786308:1252 Did not bind view model UsageViewModel to target #wizard_plugin_tracking since it does not exist
packed_core.js?40786308:1252 Did not bind view model SoftwareUpdateViewModel to target #softwareupdate_confirmation_dialog since it does not exist
packed_core.js?40786308:1252 Did not bind view model SoftwareUpdateViewModel to target #wizard_plugin_softwareupdate since it does not exist
packed_plugins.js?7fe8d822:884 onAfterBinding
packed_core.js?40786308:220 User user logged in
packed_core.js?40786308:225 Login mechanism: http
packed_core.js?40786308:1257 ... binding done
packed_core.js?40786308:1257 Application startup complete
6x The resource <URL> was preloaded using link preload but not used within a few seconds from the window's load event. Please make sure it has an appropriate `as` value and it is preloaded intentionally.
packed_plugins.js?7fe8d822:2498 THREE.WebGLRenderer: Error creating WebGL context.
dg @ packed_plugins.js?7fe8d822:2498
packed_core.js?40786308:1193 Error calling onTabChange on view model PrettyGCodeViewModel : Error: Error creating WebGL context.
    at new dg (http://octopi.lan/static/webassets/packed_plugins.js?7fe8d822:2497:448)
    at initThree (http://octopi.lan/static/webassets/packed_plugins.js?7fe8d822:2014:32)
    at PrettyGCodeViewModel.self.onTabChange (http://octopi.lan/static/webassets/packed_plugins.js?7fe8d822:1051:29)
    at callViewModelIf (http://octopi.lan/static/webassets/packed_core.js?40786308:1192:75)
    at http://octopi.lan/static/webassets/packed_core.js?40786308:1186:138
    at Pn (http://octopi.lan/static/webassets/packed_libs.js?86afb3b9:30:530)
    at Function.<anonymous> (http://octopi.lan/static/webassets/packed_libs.js?86afb3b9:51:66)
    at callViewModelsIf (http://octopi.lan/static/webassets/packed_core.js?40786308:1186:95)
    at callViewModels (http://octopi.lan/static/webassets/packed_core.js?40786308:1185:56)
    at Object.OctoPrint.coreui.exports.onTabChange (http://octopi.lan/static/webassets/packed_core.js?40786308:1213:47)
callViewModelIf @ packed_core.js?40786308:1193
packed_core.js?40786308:449 Terminal: Detected very slow client (needed 459ms for processing new log data), completely disabling terminal output during printing
TerminalViewModel.self._disableUnfancy @ packed_core.js?40786308:449
TerminalViewModel.self.fromCurrentData @ packed_core.js?40786308:451
callViewModelIf @ packed_core.js?40786308:1192
(anonymous) @ packed_core.js?40786308:1186
Pn @ packed_libs.js?86afb3b9:30
(anonymous) @ packed_libs.js?86afb3b9:51
callViewModelsIf @ packed_core.js?40786308:1186
callViewModels @ packed_core.js?40786308:1185
(anonymous) @ packed_core.js?40786308:1069
DataUpdater.self._ifInitialized @ packed_core.js?40786308:1083
DataUpdater.self._onCurrentData @ packed_core.js?40786308:1069
(anonymous) @ packed_client.js?0a0190d8:20
Pn @ packed_libs.js?86afb3b9:30
(anonymous) @ packed_libs.js?86afb3b9:51
OctoPrintSocketClient.propagateMessage @ packed_client.js?0a0190d8:20
(anonymous) @ packed_client.js?0a0190d8:27
(anonymous) @ packed_libs.js?86afb3b9:47
_t @ packed_libs.js?86afb3b9:35
(anonymous) @ packed_libs.js?86afb3b9:46
(anonymous) @ packed_libs.js?86afb3b9:51
onMessage @ packed_client.js?0a0190d8:27
r.dispatchEvent @ packed_libs.js?86afb3b9:1599
(anonymous) @ packed_libs.js?86afb3b9:1599
w._transportMessage @ packed_libs.js?86afb3b9:1599
i.emit @ packed_libs.js?86afb3b9:1599
ws.onmessage @ packed_libs.js?86afb3b9:1599
packed_core.js?40786308:447 Terminal: Detected slow client (needed 741ms for processing new log data), disabling fancy terminal functionality
TerminalViewModel.self._disableFancy @ packed_core.js?40786308:447
TerminalViewModel.self.fromCurrentData @ packed_core.js?40786308:451
callViewModelIf @ packed_core.js?40786308:1192
(anonymous) @ packed_core.js?40786308:1186
Pn @ packed_libs.js?86afb3b9:30
(anonymous) @ packed_libs.js?86afb3b9:51
callViewModelsIf @ packed_core.js?40786308:1186
callViewModels @ packed_core.js?40786308:1185
(anonymous) @ packed_core.js?40786308:1069
DataUpdater.self._ifInitialized @ packed_core.js?40786308:1083
DataUpdater.self._onCurrentData @ packed_core.js?40786308:1069
(anonymous) @ packed_client.js?0a0190d8:20
Pn @ packed_libs.js?86afb3b9:30
(anonymous) @ packed_libs.js?86afb3b9:51
OctoPrintSocketClient.propagateMessage @ packed_client.js?0a0190d8:20
(anonymous) @ packed_client.js?0a0190d8:27
(anonymous) @ packed_libs.js?86afb3b9:47
_t @ packed_libs.js?86afb3b9:35
(anonymous) @ packed_libs.js?86afb3b9:46
(anonymous) @ packed_libs.js?86afb3b9:51
onMessage @ packed_client.js?0a0190d8:27
r.dispatchEvent @ packed_libs.js?86afb3b9:1599
(anonymous) @ packed_libs.js?86afb3b9:1599
w._transportMessage @ packed_libs.js?86afb3b9:1599
i.emit @ packed_libs.js?86afb3b9:1599
ws.onmessage @ packed_libs.js?86afb3b9:1599
packed_core.js?40786308:449 Terminal: Client speed recovered, enabling fancy terminal functionality
packed_core.js?40786308:447 Terminal: Detected slow client (needed 710ms for processing new log data), disabling fancy terminal functionality
TerminalViewModel.self._disableFancy @ packed_core.js?40786308:447
TerminalViewModel.self.fromCurrentData @ packed_core.js?40786308:451
callViewModelIf @ packed_core.js?40786308:1192
(anonymous) @ packed_core.js?40786308:1186
Pn @ packed_libs.js?86afb3b9:30
(anonymous) @ packed_libs.js?86afb3b9:51
callViewModelsIf @ packed_core.js?40786308:1186
callViewModels @ packed_core.js?40786308:1185
(anonymous) @ packed_core.js?40786308:1069
DataUpdater.self._ifInitialized @ packed_core.js?40786308:1083
DataUpdater.self._onCurrentData @ packed_core.js?40786308:1069
(anonymous) @ packed_client.js?0a0190d8:20
Pn @ packed_libs.js?86afb3b9:30
(anonymous) @ packed_libs.js?86afb3b9:51
OctoPrintSocketClient.propagateMessage @ packed_client.js?0a0190d8:20
(anonymous) @ packed_client.js?0a0190d8:27
(anonymous) @ packed_libs.js?86afb3b9:47
_t @ packed_libs.js?86afb3b9:35
(anonymous) @ packed_libs.js?86afb3b9:46
(anonymous) @ packed_libs.js?86afb3b9:51
onMessage @ packed_client.js?0a0190d8:27
r.dispatchEvent @ packed_libs.js?86afb3b9:1599
(anonymous) @ packed_libs.js?86afb3b9:1599
w._transportMessage @ packed_libs.js?86afb3b9:1599
i.emit @ packed_libs.js?86afb3b9:1599
ws.onmessage @ packed_libs.js?86afb3b9:1599
packed_core.js?40786308:449 Terminal: Client speed recovered, enabling fancy terminal functionality
packed_core.js?40786308:447 Terminal: Detected slow client (needed 634ms for processing new log data), disabling fancy terminal functionality
TerminalViewModel.self._disableFancy @ packed_core.js?40786308:447
TerminalViewModel.self.fromCurrentData @ packed_core.js?40786308:451
callViewModelIf @ packed_core.js?40786308:1192
(anonymous) @ packed_core.js?40786308:1186
Pn @ packed_libs.js?86afb3b9:30
(anonymous) @ packed_libs.js?86afb3b9:51
callViewModelsIf @ packed_core.js?40786308:1186
callViewModels @ packed_core.js?40786308:1185
(anonymous) @ packed_core.js?40786308:1069
DataUpdater.self._ifInitialized @ packed_core.js?40786308:1083
DataUpdater.self._onCurrentData @ packed_core.js?40786308:1069
(anonymous) @ packed_client.js?0a0190d8:20
Pn @ packed_libs.js?86afb3b9:30
(anonymous) @ packed_libs.js?86afb3b9:51
OctoPrintSocketClient.propagateMessage @ packed_client.js?0a0190d8:20
(anonymous) @ packed_client.js?0a0190d8:27
(anonymous) @ packed_libs.js?86afb3b9:47
_t @ packed_libs.js?86afb3b9:35
(anonymous) @ packed_libs.js?86afb3b9:46
(anonymous) @ packed_libs.js?86afb3b9:51
onMessage @ packed_client.js?0a0190d8:27
r.dispatchEvent @ packed_libs.js?86afb3b9:1599
(anonymous) @ packed_libs.js?86afb3b9:1599
w._transportMessage @ packed_libs.js?86afb3b9:1599
i.emit @ packed_libs.js?86afb3b9:1599
ws.onmessage @ packed_libs.js?86afb3b9:1599
packed_core.js?40786308:449 Terminal: Client speed recovered, enabling fancy terminal functionality
5922packed_plugins.js?7fe8d822:641 PrintHeadSimulator buffer overflow

if you need more details, please let me know.