Local and production CP suddenly shows no collections content anymore

[Sennik]

I have a strange situation:

Collections overview show a list with all collections with on the right the collection entries count, but when I open the collection it is empty (no entries shown at all). The website is working normal.

Console shows on flat collections (like News):

TypeError: this.resourceMeta is null
    totalItems Pagination.vue:154
    VueJS 3
    o Pagination.vue:1
    VueJS 33

And on multilevel collection like pages

Uncaught (in promise) Error: Network Error
    exports createError.js:16
    onerror xhr.js:99
    exports xhr.js:96
    exports xhr.js:13
    exports dispatchRequest.js:53
    request Axios.js:108
    e Axios.js:129
    exports bind.js:9
    getPages PageTree.vue:138
    created PageTree.vue:122
    VueJS 47
    start Statamic.js:87
    <anonymous> data:text/javascript;base64,U3RhdGFtaWMuc3RhcnQoKQ==:1

No errors in the debugbar or laravel.log

Both are multisite environments (Local is currently used for a translation) and the problem occurs in the local AND production environment (while production is not changed updated recently), Both are different versions at the moment, the local environment will be the latest version which will replace the site on production.

It appears to be an external problem, very strange!

[Sennik]

Please ignore, the problem lies in the browser (Firefox)! Chrome works, I assume FF aftere a restart too.