Fixed dynamic script injection failing sometimes with "No matching message handler" error.

Author: hackademix

src/bg/RequestUtil.js

@@ -30,7 +30,14 @@
         frameId,
       }, details);
       try {
-        await browser.tabs.executeScript(tabId, details);
+        for (let attempts = 10; attempts-- > 0;) {
+          try {
+            await browser.tabs.executeScript(tabId, details);
+          } catch(e) {
+            if (!/No matching message handler/.test(e.message)) throw e;
+            debug("Couldn't inject script into %s: too early? Retrying up to %s times...", url, attempts);
+          }
+        }
         count++;
         debug("Execute on start OK", url, details);
       } catch (e) {

src/content/content.js

@@ -85,8 +85,13 @@ async function init() {
     debug("canScript:", canScript);
   } catch (e) {
     debug("Error querying canScript", e);
-    // background script not initialized yet?
-    setTimeout(() => init(), 100);
+    if (document.readyState !== "complete" &&
+      document.URL !== "about:blank" && 
+      /Receiving end does not exist/.test(e.message)) {
+      window.location.reload(false);
+    } else {
+      setTimeout(() => init(), 100);
+    }
     return;
   } finally {
     queryingCanScript = false;