右クリックメニューから画像検索

context-google-image-search.uc.js

<?xml version="1.0" encoding="UTF-8"?>
<overlay xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
<!--
// ==UserScript==
// @name          Context Google Image Search
// @description   右クリックメニューから画像検索
// @version       1.0
// @include       main
// @compatibility Firefox 45
// @author        oflow
// @namespace     https://oflow.me/
// ==/UserScript==
-->

<script type="application/x-javascript"><![CDATA[
var ucjsContextGoogleImage = {
    init: function() {
        document.getElementById('contentAreaContextMenu').addEventListener('popupshowing', this, false);
        window.addEventListener('unload', this, false);
    },
    handleEvent: function(event) {
        switch (event.type) {
            case 'popupshowing':
                document.getElementById('context-google-image-search').hidden = !gContextMenu.mediaURL;
                break;
            case 'unload':
                document.getElementById('contentAreaContextMenu').removeEventListener('popupshowing', this, false);
                window.removeEventListener('unload', this, false);
        }
    },
    search: function() {
        if (!gContextMenu.mediaURL) return;
        gBrowser.addTab('https://www.google.co.jp/searchbyimage?image_url=' + encodeURIComponent(gContextMenu.mediaURL));
    }
}
ucjsContextGoogleImage.init();
]]></script>
<menupopup id="contentAreaContextMenu">
  <menuitem id="context-google-image-search"
            label="画像を Google で検索"
            accesskey="S"
            oncommand="ucjsContextGoogleImage.search()"
            hidden="true"
            insertafter="context-copyimage" />
</menupopup>
</overlay>