Update UI and catch executeScript errors now shown in Canary

go-back-with-backspace/_locales/en/messages.json

Index: go-back-with-backspace/_locales/en/messages.json
diff --git a/go-back-with-backspace/_locales/en/messages.json b/go-back-with-backspace/_locales/en/messages.json
index 481193a4b90b594c41de0e01f9432b65c01471d4..5ac99de035acff1efe5d004be43f3f0a7c55412c 100644
--- a/go-back-with-backspace/_locales/en/messages.json
+++ b/go-back-with-backspace/_locales/en/messages.json
@@ -12,15 +12,15 @@
     "description": "Used in the page title and top heading of the options page."
   },
   "optionsBlacklist": {
-    "message": "Backspace should never navigate back on these pages (one per line):",
+    "message": "Backspace should never go back on these pages (one per line):",
     "description": "Heading for the text entry box in which the user enters a list of pages on which the backspace extension should never go back."
   },
   "optionsAppletCheckbox": {
-    "message": "Backspace should also not navigate back in embedded applets (Flash, Java, etc.).",
+    "message": "Backspace should not go back in applets (Flash, Java, PDF, and certain chat tools).",
     "description": "Label for a checkbox indicating whether the extension should go back when focus is in embedded content such as a Java or Flash applet."
   },
   "optionsWhitelist": {
-    "message": "But even in an embedded applet, backspace should navigate back on these pages:",
+    "message": "Even in an applet, backspace should go back on these pages:",
     "description": "Heading for the text entry box in which the user enters a list of pages on which the backspace extension should go back even when focus is in embedded content."
   },
   "optionsSave": {
@@ -89,7 +89,7 @@
   },
   "reportBody": {
     "message": "Is something not working properly? A feature you'd like to see in this extension? Let us know! (We won't be able to respond to every piece of feedback individually, but we appreciate your time and thoughts.)",
-    "description": "Initial body of the feedback email created by the 'Send feedback' button in places where there is no relevant URL (e.g., the installation notes page)."
+    "description": "Initial body of the feedback email created by the 'Send feedback' button in places where there is no relevant URL (e.g., the options page)."
   },
   "reportBodyWithURL": {
     "message": "The extension doesn't do the right thing on the page at\n$URL$.\n\nAdd any details below. Which part of the page doesn't work properly? (We won't be able to respond to every piece of feedback individually, but we appreciate your time and thoughts.)",