Issue 5817 - Retry sending suggested filters to block element dialog

lib/filterComposer.js

Index: lib/filterComposer.js
diff --git a/lib/filterComposer.js b/lib/filterComposer.js
index ad6a434377614251f1c0c0b80d3b782b7f94daea..304aac40647e3144042119453262a2d5ed807d0e 100644
--- a/lib/filterComposer.js
+++ b/lib/filterComposer.js
@@ -226,12 +226,24 @@ port.on("composer.openDialog", (message, sender) =>
   {
     let popupPageId = window.tabs[0].id;
 
+    let doInitAttempt = 0;
     let doInit = () =>
     {
+      doInitAttempt += 1;
+      if (doInitAttempt > 3)
+        return;
+
       browser.tabs.sendMessage(popupPageId, {
         type: "composer.dialog.init",
         sender: sender.page.id,
         filters: message.filters
+      }).catch(e =>
+      {
+        // Firefox sometimes sets the status for a window to "complete" before
+        // it is ready to receive messages[1]. As a workaround we'll try again a
+        // few times with a second delay.
+        // [1] - https://bugzilla.mozilla.org/show_bug.cgi?id=1418655
+        setTimeout(doInit, 1000);
       });
     };
     if (window.tabs[0].status != "complete")