Issue 6539, 6782 - Implement support for snippets

lib/requestBlocker.js

Index: lib/requestBlocker.js
===================================================================
--- a/lib/requestBlocker.js
+++ b/lib/requestBlocker.js
@@ -62,20 +62,21 @@
 
   for (let type in browser.webRequest.ResourceType)
     yield resourceTypes.get(browser.webRequest.ResourceType[type]) || "OTHER";
 
   // WEBRTC gets addressed through a workaround, even if the webRequest API is
   // lacking support to block this kind of a request.
   yield "WEBRTC";
 
-  // POPUP, CSP and ELEMHIDE filters aren't mapped to resource types.
+  // ELEMHIDE, POPUP, CSP, and SNIPPET filters aren't mapped to resource types.
+  yield "ELEMHIDE";
   yield "POPUP";
-  yield "ELEMHIDE";
   yield "CSP";
+  yield "SNIPPET";
 }());
 
 function onBeforeRequestAsync(page, url, type, docDomain,
                               thirdParty, sitekey,
                               specificOnly, filter)
 {
   if (filter)
     FilterNotifier.emit("filter.hitCount", filter, 0, 0, page);
@@ -93,17 +94,16 @@
 ext.webRequest.onBeforeRequest.addListener((url, type, page, frame) =>
 {
   let docDomain = null;
   let sitekey = null;
   let specificOnly = false;
   let thirdParty = false;
   let urlString = stringifyURL(url);
 
-
   if (frame && page)
   {
     if (checkWhitelisted(page, frame))
       return true;
 
     docDomain = extractHostFromFrame(frame);
     sitekey = getKey(page, frame);
     thirdParty = isThirdParty(url, docDomain);