Remove support for legacy extensions

functions/network.js

@@ -1,30 +1,13 @@
 import AxiosStrategy from "./strategies/AxiosStrategy"
 import ExtensionStrategy, { hasExtensionInstalled } from "./strategies/ExtensionStrategy"
-import FirefoxStrategy from "./strategies/FirefoxStrategy"
-import ChromeStrategy, { hasChromeExtensionInstalled } from "./strategies/ChromeStrategy"
 
 const isExtensionsAllowed = ({ state }) =>
   typeof state.postwoman.settings.EXTENSIONS_ENABLED === "undefined" ||
   state.postwoman.settings.EXTENSIONS_ENABLED
 
 const runAppropriateStrategy = (req, store) => {
-  if (isExtensionsAllowed(store)) {
-    if (hasExtensionInstalled()) {
-      return ExtensionStrategy(req, store)
-    }
-
-    // The following strategies are deprecated and kept to support older version of the extensions
-
-    // Chrome Provides a chrome object for scripts to access
-    // Check its availability to say whether you are in Google Chrome
-    if (window.chrome && hasChromeExtensionInstalled()) {
-      return ChromeStrategy(req, store)
-    }
-    // The firefox plugin injects a function to send requests through it
-    // If that is available, then we can use the FirefoxStrategy
-    if (window.firefoxExtSendRequest) {
-      return FirefoxStrategy(req, store)
-    }
+  if (isExtensionsAllowed(store) && hasExtensionInstalled()) {
+    return ExtensionStrategy(req, store)
   }
 
   return AxiosStrategy(req, store)