webextensionのインストールに失敗する
FirefoxでのWebextensionのインストールに失敗します
about:debugging
から一時的なアドオンを読み込む
をクリックし、manifest.jsonを選択するとThere was an error during installation: Extension is invalid
とだけ表示されます
どうすれば良いのでしょうか?
manifest.json
{
"manifest_version": 2,
"name": "Beastify",
"version": 1.0,
"description": "add a browser action icon to the toolbar. Click the button to choose a beast. The active tab's body content is then replaced with a picture of the choosen beast.",
"icons": {
"48": "icons/beasts-48.png"
},
"permissions": [
"activeTab"
],
"browser_action": {
"default_icon": "icons/beasts-32.png",
"default_title": "Beastify",
"default_popup": "popup/choose_beast.html"
},
"web_accessible_resources": [
"beasts/frog.jpg",
"beasts/turtle.jpg",
"beasts/snake.jpg"
]
}