Offer cross-origin abort in userscripts if available.

src/Monitoring/ThreadWatcher.coffee

@@ -177,6 +177,7 @@ ThreadWatcher =
     ajax = if (siteID is Site.hostname) then $.ajax else CrossOrigin.ajax
     req = ajax url,
       onloadend: ->
+        @finished = true
         ThreadWatcher.fetched++
         if ThreadWatcher.fetched is ThreadWatcher.requests.length
           ThreadWatcher.requests = []
@@ -192,7 +193,7 @@ ThreadWatcher =
     ThreadWatcher.requests.push req
 
   abort: ->
-    for req in ThreadWatcher.requests when req.readyState isnt 4 # DONE
+    for req in ThreadWatcher.requests when !req.finished
       req.abort?()
     return
 

src/platform/CrossOrigin.coffee

@@ -87,7 +87,7 @@ CrossOrigin =
       response: null
 
     <% if (type === 'userscript') { %>
-    (GM?.xmlHttpRequest or GM_xmlhttpRequest)
+    gmReq = (GM?.xmlHttpRequest or GM_xmlhttpRequest)
       method: "GET"
       url: url+''
       timeout: timeout
@@ -99,6 +99,7 @@ CrossOrigin =
       onerror:   -> onloadend.call(req)
       onabort:   -> onloadend.call(req)
       ontimeout: -> onloadend.call(req)
+    req.abort = gmReq.abort
     <% } %>
 
     <% if (type === 'crx') { %>