Fixed. Zotero 8 suddenly not starting

nonebut

Fixed, error in usage

Zotero 8.0.4 as of my last query
Installed from archive downloaded from zotero.org servers
Linux + XFCE

I used to start zotero using zotero.desktop placed in zotero installation dir.
Due to ongoing problems I was on trying Debug Output Logging and Restart with Logging Enabled...
Subsequently to latter one zotero instance doesn't get invoked by the use of its .desktop.
Only starting from shell works
$ /opt/zotero installation dir/zotero -ZoteroDebugText

user_pref("extensions.zotero.debug.store", false);
user_pref("extensions.zotero.debug.log", false);
in user profile user.js doesn't help.

$ /opt/Zotero_linux-x86_64/zotero
JavaScript error: , line 0: Error: Failed to load resource://services-settings/remote-settings.sys.mjs
JavaScript error: resource://gre/modules/EssentialDomainsRemoteSettings.sys.mjs, line 41: Error: Failed to load resource://services-settings/remote-settings.sys.mjs
JavaScript error: resource://gre/modules/SimpleURIUnknownSchemesRemoteObserver.sys.mjs, line 45: Error: Failed to load resource://services-settings/remote-settings.sys.mjs
Missing chrome or resource URL: chrome://zotero/skin/16/white/loading.svg
Crash Annotation GraphicsCriticalError: |[0][GFX1-]: IPC Channel is already torn down unexpectedly
(t=8.42824) [GFX1-]: IPC Channel is already torn down unexpectedly

Crash Annotation GraphicsCriticalError: |[0][GFX1-]: IPC Channel is already torn down unexpectedly
(t=8.42824) |[1][GFX1-]: IPC Channel is already torn down unexpectedly
(t=8.44491) [GFX1-]: IPC Channel is already torn down unexpectedly

How to fix?