Trying to run in Firefox. Freezes on Booting 2/4 : Web or Service Worker

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Console message :

 [Show/hide group.] BOOT boot.js:120:5
lively4url: https://lively-kernel.org/lively4/lively4-core boot.js:146:5
[Show/hide group.] 1/4: Setup SystemJS. boot.js:108:7
[Show/hide group.] 1/4: Invalidate Caches. boot.js:108:7
[Show/hide group.] 2/4: Wait for Service Worker. boot.js:108:7
unreachable code after return statement[Learn More] system.src.js:259:20
LOAD Lively4: boot lively4 service worker load.js:38:2
NO Service worker during migration!!! load.js:126:4
[Lively4] Use existing service worker load.js:134:6
Load Lively4 load.js:94:8
TypeError: navigator.webkitPersistentStorage is undefined[Learn More] system.src.js line 536 > eval:173:11
unreachable code after return statement[Learn More] system.src.js line 536 > eval:259:20
Load preferences preferences.js:28:4
defere Post load expose expose.js:306:6
27.212s  loaded lively intializer lively.js:1744:2
0.005s  loaded lively lively.js:1757
Post load expose expose.js:296:6
LOADED plex plex-scheme.js:199
6.727s  load component: https://lively-kernel.org/lively4/lively4-core/src/components/widgets/lively-window.html component-loader.js:439:4
0.633s  load component: https://lively-kernel.org/lively4/lively4-core/src/components/tools/lively-editor.html component-loader.js:439:4
0.376s  load component: https://lively-kernel.org/lively4/lively4-core/src/components/widgets/lively-script.html component-loader.js:439:4
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[JensLincke]