diff --git a/src/background/rss.ts b/src/background/rss.ts
index c932d22..d373665 100644
--- a/src/background/rss.ts
+++ b/src/background/rss.ts
@@ -44,7 +44,7 @@ export const getRSS = async (tabId, url) => {
         tabId,
       })
 
-      if (chrome.offscreen) {
+      if (chrome.offscreen && chrome.runtime.getContexts) {
         await setupOffscreenDocument("tabs/offscreen.html")
         chrome.runtime.sendMessage({
           target: "offscreen",
diff --git a/src/background/rules.ts b/src/background/rules.ts
index c790926..1baa8c8 100644
--- a/src/background/rules.ts
+++ b/src/background/rules.ts
@@ -12,7 +12,7 @@ const storage = new Storage({
 export const refreshRules = async () => {
   const rules = await getRemoteRules()
   await storage.set("rules", rules)
-  if (chrome.offscreen) {
+  if (chrome.offscreen && chrome.runtime.getContexts) {
     await setupOffscreenDocument("tabs/offscreen.html")
     chrome.runtime.sendMessage({
       target: "offscreen",