ignore message errors

lib/frame-tree/content/frame-tree.js

@@ -51,7 +51,7 @@ this.FrameTree = this.FrameTree || (() => {
 				content: getDoctype(document) + document.documentElement.outerHTML,
 				baseURI: document.baseURI,
 				title: document.title
-			});
+			}).catch(() => {/* ignored */ });
 		}
 	});
 	addEventListener("message", event => {
@@ -78,7 +78,7 @@ this.FrameTree = this.FrameTree || (() => {
 					browser.runtime.sendMessage({
 						method: "FrameTree.getDataRequest",
 						windowId: frameData.windowId
-					});
+					}).catch(() => {/* ignored */ });
 				}
 				frameData.getDataResponseTimeout = setTimeout(() => top.postMessage(MESSAGE_PREFIX + "::" + JSON.stringify({ method: "getDataResponse", windowId: frameData.windowId }), "*"), TIMEOUT_DATA_RESPONSE_MESSAGE);
 			});
@@ -108,7 +108,10 @@ this.FrameTree = this.FrameTree || (() => {
 					frameData.processed = true;
 				}
 				if (!pendingCount || pendingCount == 1) {
-					browser.runtime.sendMessage({ method: "FrameTree.initResponse" });
+					browser.runtime.sendMessage({ method: "FrameTree.initResponse" })
+						.catch(error => {
+							//ignored
+						});
 				}
 			}
 		} else {