Examine source code of Copy Links as CSV

{
    "manifest_version": 2,
    "name": "Copy Links in Selection",
    "version": "0.0.4",
    "applications": {
        "gecko": {
            "id": "{52e9d6b3-169c-44f3-8884-1f136295293a}"
        }
    },
    "description": "Copy all links in the selected area, which can be used as input of TTS reader.",
    "icons": {
        "48": "img/icon_black.svg"
    },
    "browser_action": {
        "default_icon": {
            "16": "img/icon_mobile.svg"  // For Android only, because Android doens't support theme_icons
        },
        "default_title": "Copy Selected Links",
        "theme_icons": [
            {
                "light": "img/icon_light.svg",
                "dark":  "img/icon_dark.svg",
                "size": 48
            }
        ]
    },
    "background": {
        "scripts": ["dist/background.js"]
    },
    "content_scripts": [
        {
            "run_at": "document_start",
            "matches": ["http://*/*", "https://*/*"],
            "js": ["dist/content.js"]
        }
    ],
    "permissions": [ "tabs", "clipboardWrite" ],
    "commands": {
        "_execute_browser_action": {
            "suggested_key": {
                "default": "Ctrl+Alt+C"
            },
            "description": "Copy all links in current selected area."
        }
    }
}