Fixes #13 (again)

Author: Timothy Johnson

dest/background.js

@@ -55,7 +55,7 @@ function attachScript(tabId, changed) {
 
   toolsPorts.get(tabId).postMessage({ type: 'init' })
   chrome.tabs.executeScript(tabId, {
-    code: `const profilerEnabled = ${profilerEnabledList.includes(tabId)}`,
+    code: `window.profilerEnabled = ${profilerEnabledList.includes(tabId)}`,
     runAt: 'document_start'
   })
   chrome.tabs.executeScript(tabId, {
@@ -69,7 +69,7 @@ function setup(tabId, port) {
   port.onDisconnect.addListener(() => {
     toolsPorts.delete(tabId)
     pagePorts.delete(tabId)
-    const i = profilerEnabledList.indexOf(msg.tabId)
+    const i = profilerEnabledList.indexOf(tabId)
     if (i != -1) profilerEnabledList.slice(i, 1)
     chrome.tabs.onUpdated.removeListener(attachScript)
   })

rollup.config.js

@@ -36,18 +36,20 @@ export default [{
     file: 'dest/privilegedContent.js',
     name: 'SvelteDevtools',
     format: 'iife',
-    banner: `const tag = document.createElement('script')
-tag.text = \``,
+    banner: `if (!window.tag) {
+  window.tag = document.createElement('script')
+  window.tag.text = \``,
     footer: `\`
-if (profilerEnabled) tag.text = tag.text.replace('let profilerEnabled = false;', '\$&\\nstartProfiler();')
-document.children[0].append(tag)
-const port = chrome.runtime.connect()
-port.onMessage.addListener(window.postMessage.bind(window))
-window.addEventListener(
-  'message',
-  e => e.source == window && port.postMessage(e.data),
-  false
-)`
+  if (window.profilerEnabled) window.tag.text = window.tag.text.replace('let profilerEnabled = false;', '\$&\\nstartProfiler();')
+  document.children[0].append(window.tag)
+  const port = chrome.runtime.connect()
+  port.onMessage.addListener(window.postMessage.bind(window))
+  window.addEventListener(
+    'message',
+    e => e.source == window && port.postMessage(e.data),
+    false
+  )
+}`
   },
   plugins: [ resolve() ]
 }, {