[BUG] Unable to load unsandboxed extension

[totchi-lagawi]

Description

I am currently developing a Scratch extension. I tried to run it from the "Load custom extension" menu, using the textbox, however I got an error, saying that Content at moz-nullprincipal:{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}?https://studio.penguinmod.com may not load data from blob:https://studio.penguinmod.com/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. and <script> source URI is not allowed in this document: “blob:https://studio.penguinmod.com/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx".. There's nothing else, and so I'm quite confused about how this happened. The extension loads fine in TurboWarp.

Reproduce the bug

• Open the extension menu
• Click on "Load custom extension"
• Go to "Text"
• Load the following extension unsandboxed

class Extension {
    getInfo() {
        return {
            id: "extension",
            name: "Extension",
            blocks: [
                {
                    opcode: "block",
                    blocktype: "command",
                    text: "Hello world!"
                }
            ]
        }
    }

    block() {
        console.log("Hello world!")
    }
}

Scratch.extensions.register(new Extension())