Abrowser console errors and warnings

Firefox 126.0.2 (64-bit) does not give any error when it's executed from the terminal, it does not give a single message.

Abrowser 126.0.2 (64-bit) on the other hand, gives several message:

JavaScript warning: resource://services-settings/RemoteSettingsClient.sys.mjs, line 225: unreachable code after return statement
JavaScript warning: resource://services-settings/Attachments.sys.mjs, line 158: unreachable code after return statement
JavaScript warning: resource://services-settings/Attachments.sys.mjs, line 380: unreachable code after return statement
JavaScript warning: resource://services-settings/Attachments.sys.mjs, line 435: unreachable code after return statement
JavaScript warning: resource://services-settings/Utils.sys.mjs, line 378: unreachable code after return statement
console.warn: services.settings: Ignoring preference override of remote settings server
console.warn: services.settings: Allow by setting MOZ_REMOTE_SETTINGS_DEVTOOLS=1 in the environment
console.error: (new TypeError("localeHandlers is undefined", "resource://gre/modules/ExtHandlerService.sys.mjs", 139))
console.error: ({})
console.error: (new TypeError("policy.extension.tabManager is undefined", "resource://gre/modules/ExtensionPermissions.sys.mjs", 559))
console.error: (new TypeError("undefined has no properties", "resource://services-settings/RemoteSettingsClient.sys.mjs", 607))
console.error: (new TypeError("undefined has no properties", "resource://services-settings/RemoteSettingsClient.sys.mjs", 607))
JavaScript error: resource://gre/modules/PromiseWorker.sys.mjs, line 75: Error: Could not get children of `/home/blues/.mozilla/abrowser/08csawhq.default-release/thumbnails': directory does not exist (NS_ERROR_FILE_NOT_FOUND)
console.error: (new TypeError("undefined has no properties", "resource://services-settings/RemoteSettingsClient.sys.mjs", 607))
console.error: (new TypeError("undefined has no properties", "resource://services-settings/RemoteSettingsClient.sys.mjs", 607))
console.error: (new TypeError("undefined has no properties", "resource://services-settings/RemoteSettingsClient.sys.mjs", 607))

• Abrowser version: I found it in 126.0.2 (64-bit), and reproduced it later (tested 129.0.2 (64-bit))