diff --git a/extensions/chromium/runet-censorship-bypass/src/extension-common/00-init-apis.js b/extensions/chromium/runet-censorship-bypass/src/extension-common/00-init-apis.js
index f4529d7..e8ba9c0 100644
--- a/extensions/chromium/runet-censorship-bypass/src/extension-common/00-init-apis.js
+++ b/extensions/chromium/runet-censorship-bypass/src/extension-common/00-init-apis.js
@@ -41,15 +41,18 @@ console.log('Extension started.');
 
     },
 
+    lastError: undefined,
+
     checkChromeError() {
 
       // Chrome API calls your cb in a context different from the point of API
       // method invokation.
-      const err = chrome.runtime.lastError || chrome.extension.lastError;
+      const err = chrome.runtime.lastError || chrome.extension.lastError || self.lastError;
       if (!err) {
         return;
       }
       console.warn('API returned error:', err);
+      delete self.lastError;
       return new Error(err.message); // Add stack.
 
     },
diff --git a/extensions/chromium/runet-censorship-bypass/src/extension-common/15-firefox-proxy-settings.js b/extensions/chromium/runet-censorship-bypass/src/extension-common/15-firefox-proxy-settings.js
index df44df1..c0e8bbc 100644
--- a/extensions/chromium/runet-censorship-bypass/src/extension-common/15-firefox-proxy-settings.js
+++ b/extensions/chromium/runet-censorship-bypass/src/extension-common/15-firefox-proxy-settings.js
@@ -5,11 +5,11 @@ if (window.apis.platform.ifFirefox) {
   const prefix = 'firefox-only';
 
   const ffxStorage = {
-    get(keys) {
+    get(key) {
       return new Promise((resolve) => (
         chrome.storage.local.get(
-          keys,
-          window.utils.getOrDie(resolve),
+          key,
+          window.utils.getOrDie((obj) => resolve(obj[key])),
         )
       ));
     },
@@ -41,9 +41,13 @@ if (window.apis.platform.ifFirefox) {
       },
     }, window.utils.chromified( async (err) => {
       if (err) {
-        throw err;
+        window.utils.lastError = err;
+        cb();
+        return;
       }
-      await ffxStorage.set({ [`${prefix}-pacData`]: pac.data });
+      window.pacData = pac.data;
+      window.ffxStorage = ffxStorage;
+      await ffxStorage.set({ [`${prefix}-pac-data`]: pac.data });
       cb();
     }));
   };
@@ -52,7 +56,9 @@ if (window.apis.platform.ifFirefox) {
   chrome.proxy.settings.get = function(details, cb) {
     originalGet(details, window.utils.chromified((err, originalDetails) => {
       if (err) {
-        throw err;
+        window.utils.lastError = err;
+        cb(originalDetails);
+        return;
       }
       const autoConfigUrl = window.utils.getProp(originalDetails, 'value.autoConfigUrl');
       if (!autoConfigUrl) {
@@ -60,7 +66,12 @@ if (window.apis.platform.ifFirefox) {
       }
       window.apis.httpLib.get(autoConfigUrl, async (err, pacData) => {
         if (err) {
-          pacData = await ffxStorage.get(`${prefix}-pacData`);
+          pacData = await ffxStorage.get(`${prefix}-pac-data`);
+          if (!pacData || !Object.keys(pacData).length) {
+            window.utils.lastError = err;
+            cb(originalDetails);
+            return;
+          }
         }
         cb(Object.assign(
           originalDetails,
@@ -79,7 +90,7 @@ if (window.apis.platform.ifFirefox) {
 
   const originalClear = chrome.proxy.settings.clear.bind( chrome.proxy.settings );
   chrome.proxy.settings.clear = async function(details, cb) {
-    await ffxStorage.remove(`${prefix}-pacData`);
+    await ffxStorage.remove(`${prefix}-pac-data`);
     originalClear(details, cb);
   };
 }
diff --git a/extensions/chromium/runet-censorship-bypass/src/extension-common/35-pac-kitchen-api.js b/extensions/chromium/runet-censorship-bypass/src/extension-common/35-pac-kitchen-api.js
index 9c1bae5..bf50d34 100644
--- a/extensions/chromium/runet-censorship-bypass/src/extension-common/35-pac-kitchen-api.js
+++ b/extensions/chromium/runet-censorship-bypass/src/extension-common/35-pac-kitchen-api.js
@@ -626,16 +626,16 @@ ${
   chrome.proxy.settings.set = function(details, cb) {
     const pac = window.utils.getProp(details, 'value.pacScript');
     if (!(pac && pac.data)) {
-      return originalSet(details, cb);
+      return originalSet(details, window.utils.timeouted(cb));
     }
     const pacMods = getCurrentConfigs();
     pac.data = pacKitchen.cook( pac.data, pacMods );
     originalSet({value: details.value}, window.utils.chromified((err) => {
 
-      if (err) {
-        throw err;
+      if (!err) {
+        kitchenState(ifIncontinence, null);
       }
-      kitchenState(ifIncontinence, null);
+      window.utils.lastError = err;
       cb && cb();
 
     }));
diff --git a/extensions/chromium/runet-censorship-bypass/src/extension-common/37-sync-pac-script-with-pac-provider-api.tmpl.js b/extensions/chromium/runet-censorship-bypass/src/extension-common/37-sync-pac-script-with-pac-provider-api.tmpl.js
index 25ce730..09689db 100644
--- a/extensions/chromium/runet-censorship-bypass/src/extension-common/37-sync-pac-script-with-pac-provider-api.tmpl.js
+++ b/extensions/chromium/runet-censorship-bypass/src/extension-common/37-sync-pac-script-with-pac-provider-api.tmpl.js
@@ -380,12 +380,10 @@
         }
       }
 
-      chrome.storage.local.clear(
-        () => chrome.storage.local.set(
-          onlySettable,
-          chromified(cb),
-        )
-      );
+      chrome.storage.local.set(
+        onlySettable,
+        chromified(cb),
+      )
 
     },