messaging: don't use browserProxy on ext pages

src/content.ts

@@ -11,10 +11,11 @@ import "./hinting"
 console.log("Tridactyl content script loaded, boss!")
 
 // Add various useful modules to the window for debugging
-import browserBg from './lib/browser_proxy'
+import * as webext from './lib/webext'
 import * as messaging from './messaging'
 
 (window as any).tri = Object.assign(Object.create(null), {
-    browserBg,
+    browserBg: webext.browserBg,
+    webext,
     messaging,
 })

src/hinting.ts

@@ -251,8 +251,7 @@ select,
 [tabindex]
 `
 
-import browserBg from './lib/browser_proxy'
-import {activeTab, l, firefoxVersionAtLeast} from './lib/webext'
+import {activeTab, browserBg, l, firefoxVersionAtLeast} from './lib/webext'
 
 async function openInBackground(url: string) {
     const thisTab = await activeTab()

src/lib/webext.ts

@@ -5,7 +5,7 @@ export function inContentScript() {
     return ! ('tabs' in browser)
 }
 
-let browserBg
+export let browserBg
 
 // Make this library work for both content and background.
 if (inContentScript()) {