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You can create a folder named "test", put:

manifest.json:

{
  "mod" : {
    "schema_version" : 2,
    "payload" : {
      "app_icon" : [ {
            "id" : "app_icon_01",
            "name" : "Test",
            "path" : "app_icon1.png"
        }
      ]
    }
  },
  "manifest_version" : 3,
  "name" : "Test",
  "icons" : {
    "512" : "icon_512.png"
  },
  "version" : "1.2.1"
}

in it, put icon_512.png and app_icon_01.png (290px x 290px) in it, goto the URL opera://extensions, turn on developer mode, click "Load unpacked" and point it to the test folder to load the extension.

Then, you can goto the URL opera://configure/mods/interface/app_icon, set the mod's icon and restart Opera.

Then, Opera's pinned taskbar icon should be that custom icon.

You can definitely create your own extension that uses a custom app icon and it will work no problem when you "Load unpacked" it in developer mode at the URL opera://extensions.

As for uploading said extension to https://store.gx.me/mods, I'm not sure if there are any restrictions for what studios are allowed to do app icons there or if there are any restrictions for what mods can be tagged with the app-icon tag. For example, I think the mods-2-0 tag is restricted to Opera-provided mods but there are still lots of mod 2.0 mods that aren't tagged as such.

You can keep installing mods form other studios and check at the URL opera://configure/mods/interface/app_icon to see if they an app icon. At https://store.gx.me/mods/, maybe sort by last modified so you get newer extensions. You'll still have to skip Opera studio mods though.

@Zilla908 Menu > Help > About Opera or go to opera://about.

@Mossy-boio Opera One, Opera GX or Opera Air?

@contx Viewing doesn't mean agreeing.

if it's hard or not to implement it may depend on the contracts.

Same issue in a test standalone installation?

Tested in Opera Developer 121.0.5600.0 (installer for it is broken though unless you do a standalone installation) based on Chromium 137 and discarding works. Might have to work to GX is based on 137.

What specific version of Windows are you on?

@mariuszlol23 It'd be under "Settings -> Accounts -> Family" in Windows if you want to double check.

Besides that, you can uninstall Opera (do not choose to delete your data when uninstalling), but this time, delete the install folder afterwards. Default location is "C:\Users\yourusername\AppData\Local\Programs\Opera".

Then, delete everything in "C:\Windows\temp" and "C:\Users\yourusername\AppData\Local\temp".

Then download Opera's installer, launch it, click "options", review and adjust everything how you want.

Besides that, you can rename the "Opera Stable" folders in "C:\Users\yourusername\AppData\Roaming\Opera Software" and "C:\Users\yourusername\AppData\Local\Opera Software" to "Opera Stable old" to see if starting with fresh data fixes it.

Besides that, I'd look into security software like Bitdefender, Kasperksy and Eset. They might be interfering. You might have to temporarily uninstall them and not just disable them to test if they're really interfering.

You should probably make sure a test standalone installation of Opera works fine. If not, then there's definitely something on your system interfering with Opera.

@Zilla908 On the About page of the desktop versions.