Allow defining a custom assets.json without adminSettings

[celenityy]

Prerequisites

• I verified that this is not a filter list issue. Report any issues with filter lists or broken website functionality in the uAssets issue tracker.
• This is NOT a YouTube, Facebook or Twitch report. These sites MUST be reported by clicking their respective links.
• This is not a support issue or a question. For support, questions, or help, visit /r/uBlockOrigin.
• I performed a cursory search of the issue tracker to avoid opening a duplicate issue.
• The issue is not present after disabling uBO in the browser.
• I checked the documentation to understand that the issue I am reporting is not normal behavior.

I tried to reproduce the issue when...

• uBO is the only extension.
• uBO uses default lists and settings.
• using a new, unmodified browser profile.

Description

AFAICT, when deploying uBlock Origin, the only way to define a custom assets.json file is via adminSettings.

Ex. for Firefox's policies.json:

    "3rdparty": {
      "Extensions": {
        "uBlock0@raymondhill.net": {
          "adminSettings": {
            "assetsBootstrapLocation": "https://example.com/assets.json"
          }
        }
      }
    }

My understanding is that the use of adminSettings is deprecated and no longer recommended, so it's important to have another way to configure this.

A specific URL where the issue occurs.

N/A

Steps to Reproduce

N/A

Expected behavior

It should be possible to define a custom assets.json for uBlock Origin without the use of adminSettings, as it's deprecated and not recommended.

Actual behavior

AFAIK, it's only possible to define a custom assets.json for uBlock Origin with the use of adminSettings.

uBO version

1.62.0

Browser name and version

Firefox 134.0.2

Operating System and version

N/A