Adds basic plugin for Figma (web version only, not desktop client)

Closes issue #953

manifest.json

@@ -1955,6 +1955,10 @@
         {
             "js": ["plugins/letterboxd.js"],
             "matches": ["*://*.letterboxd.com/*"]
+        },
+        {
+            "js": ["plugins/figma.js"],
+            "matches": ["*://*.figma.com/files/*"]
         }
     ]
 }

plugins/figma.js

@@ -0,0 +1,21 @@
+var hoverZoomPlugins = hoverZoomPlugins || [];
+hoverZoomPlugins.push({
+    name:'figma.com',
+    version:'0.1',
+    prepareImgLinks:function (callback) {
+        var res = [];
+        $('[class*=generic_tile_thumbnail--thumbnailFullWidth]').each(function () {
+            var elem = $(this);
+
+            var url = hoverZoom.getThumbUrl(this);
+
+            var target = elem.parents('a');
+            if (target.length > 0) elem = $(target[0]);
+
+            elem.data().hoverZoomSrc = [url];
+            res.push(elem);
+        });
+
+        callback($(res));
+    }
+});