firefox2koreader/firefoxplugin/manifest.json

{
    "manifest_version": 2,
    "name": "Firefox KOReader",
    "version": "1.0",
    "description": "Sync articles instantly to your KOReader",
    "icons": {
        "48": "icons/border-48.png"
    },
    "permissions": [
        "tabs",
        "<all_urls>"
    ],
    "browser_action": {
        "default_icon": "icons/koreader.png",
        "default_title": "Show on KOReader"
    },
    "background": {
        "scripts": ["background.js"]
    }
}