contentscript - skip web3 injection if domain appears to be a pdf

app/scripts/contentscript.js

@@ -1,6 +1,13 @@
 const LocalMessageDuplexStream = require('./lib/local-message-stream.js')
 const PortStream = require('./lib/port-stream.js')
 const ObjectMultiplex = require('./lib/obj-multiplex')
+const urlUtil = require('url')
+
+if (shouldInjectWeb3()) {
+  setupInjection()
+}
+
+function setupInjection(){
 
   // inject in-page script
   var scriptTag = document.createElement('script')
@@ -34,3 +41,12 @@ reloadStream.on('error', console.error.bind(console))
   pluginStream.on('close', function () {
     reloadStream.write({ method: 'reset' })
   })
+
+}
+
+function shouldInjectWeb3(){
+  var urlData = urlUtil.parse(window.location.href)
+  var extension = urlData.pathname.split('.').slice(-1)[0]
+  var shouldInject = (extension !== 'pdf')
+  return shouldInject
+}