Prevent suppressing executable warnings using the "don't ask me this again" checkbox.

A hidden preference matching the behavior of "browser.download.manager.alertOnEXEOpen" is kept, but is renamed in order to recover cases where the checkbox was used accidentally.
While there, simplify the `confirmLaunchExecutable` function by converting from promises to async function.
Since Basilisk moved this prompting to toolkit, we also clean up some unused duplicate strings from application/basilisk while we're there.

This resolves #581

application/basilisk/components/downloads/DownloadsCommon.jsm

@@ -86,8 +86,7 @@ const kDownloadsStringsRequiringFormatting = {
   shortTimeLeftHours: true,
   shortTimeLeftDays: true,
   statusSeparator: true,
-  statusSeparatorBeforeNumber: true,
-  fileExecutableSecurityWarning: true
+  statusSeparatorBeforeNumber: true
 };
 
 const kDownloadsStringsRequiringPluralForm = {

application/basilisk/locales/en-US/chrome/browser/downloads/downloads.properties

@@ -96,10 +96,6 @@ shortTimeLeftDays=%1$Sd
 statusSeparator=%1$S \u2014 %2$S
 statusSeparatorBeforeNumber=%1$S \u2014  %2$S
 
-fileExecutableSecurityWarning=“%S” is an executable file. Executable files may contain viruses or other malicious code that could harm your computer. Use caution when opening this file. Are you sure you want to launch “%S”?
-fileExecutableSecurityWarningTitle=Open Executable File?
-fileExecutableSecurityWarningDontAsk=Don’t ask me this again
-
 # LOCALIZATION NOTE (otherDownloads2):
 # This is displayed in an item at the bottom of the Downloads Panel when
 # there are more downloads than can fit in the list in the panel. Use a

application/palemoon/components/downloads/DownloadsCommon.jsm

@@ -77,7 +77,7 @@ const nsIDM = Ci.nsIDownloadManager;
 const kDownloadsStringBundleUrl =
   "chrome://browser/locale/downloads/downloads.properties";
 
-const kPrefBdmAlertOnExeOpen = "browser.download.manager.alertOnEXEOpen";
+const kPrefConfirmOpenExe = "browser.download.confirmOpenExecutable";
 
 const kDownloadsStringsRequiringFormatting = {
   sizeWithUnits: true,
@@ -530,8 +530,10 @@ this.DownloadsCommon = {
     if (aFile.isExecutable() && !isWindowsExe) {
       let showAlert = true;
       try {
-        showAlert = Services.prefs.getBoolPref(kPrefBdmAlertOnExeOpen);
-      } catch (ex) { }
+        showAlert = Services.prefs.getBoolPref(kPrefConfirmOpenExe);
+      } catch (ex) {
+        // If the preference does not exist, continue with the prompt.
+      }
 
       if (showAlert) {
         let name = aFile.leafName;
@@ -539,18 +541,11 @@ this.DownloadsCommon = {
           DownloadsCommon.strings.fileExecutableSecurityWarning(name, name);
         let title =
           DownloadsCommon.strings.fileExecutableSecurityWarningTitle;
-        let dontAsk =
-          DownloadsCommon.strings.fileExecutableSecurityWarningDontAsk;
 
-        let checkbox = { value: false };
-        let open = Services.prompt.confirmCheck(aOwnerWindow, title, message,
-                                                dontAsk, checkbox);
+        let open = Services.prompt.confirm(aOwnerWindow, title, message);
         if (!open) {
           return;
         }
-
-        Services.prefs.setBoolPref(kPrefBdmAlertOnExeOpen,
-                                   !checkbox.value);
       }
     }
 

toolkit/components/jsdownloads/src/DownloadUIHelper.jsm

@@ -124,52 +124,35 @@ this.DownloadPrompter.prototype = {
 
   /**
    * Displays a warning message box that informs that the specified file is
-   * executable, and asks whether the user wants to launch it.  The user is
-   * given the option of disabling future instances of this warning.
+   * executable, and asks whether the user wants to launch it.
    *
    * @param aPath
    *        String containing the full path to the file to be opened.
    *
-   * @return {Promise}
    * @resolves Boolean indicating whether the launch operation can continue.
-   * @rejects JavaScript exception.
    */
-  confirmLaunchExecutable: function (aPath)
+  async confirmLaunchExecutable: function (aPath)
   {
-    const kPrefAlertOnEXEOpen = "browser.download.manager.alertOnEXEOpen";
+    const kPrefConfirmOpenExe = "browser.download.confirmOpenExecutable";
+
+    // Always launch in case we have no prompter implementation.
+    if (!this._prompter) {
+      return true;
+    }
 
     try {
-      // Always launch in case we have no prompter implementation.
-      if (!this._prompter) {
-        return Promise.resolve(true);
+      if (!Services.prefs.getBoolPref(kPrefConfirmOpenExe)) {
+        return true;
       }
-
-      try {
-        if (!Services.prefs.getBoolPref(kPrefAlertOnEXEOpen)) {
-          return Promise.resolve(true);
-        }
-      } catch (ex) {
-        // If the preference does not exist, continue with the prompt.
-      }
-
-      let leafName = OS.Path.basename(aPath);
-
-      let s = DownloadUIHelper.strings;
-      let checkState = { value: false };
-      let shouldLaunch = this._prompter.confirmCheck(
-                           s.fileExecutableSecurityWarningTitle,
-                           s.fileExecutableSecurityWarning(leafName, leafName),
-                           s.fileExecutableSecurityWarningDontAsk,
-                           checkState);
-
-      if (shouldLaunch) {
-        Services.prefs.setBoolPref(kPrefAlertOnEXEOpen, !checkState.value);
-      }
-
-      return Promise.resolve(shouldLaunch);
     } catch (ex) {
-      return Promise.reject(ex);
+      // If the preference does not exist, continue with the prompt.
     }
+
+    let leafName = OS.Path.basename(aPath);
+
+    let s = DownloadUIHelper.strings;
+    return this._prompter.confirm(s.fileExecutableSecurityWarningTitle,
+                                  s.fileExecutableSecurityWarning(leafName, leafName));
   },
 
   /**

toolkit/locales/en-US/chrome/mozapps/downloads/downloads.properties

@@ -134,7 +134,6 @@ downloadsTitlePercent=#2% of #1 file - Downloads;#2% of #1 files - Downloads
 
 fileExecutableSecurityWarning=“%S” is an executable file. Executable files may contain viruses or other malicious code that could harm your computer. Use caution when opening this file. Are you sure you want to launch “%S”?
 fileExecutableSecurityWarningTitle=Open Executable File?
-fileExecutableSecurityWarningDontAsk=Don’t ask me this again
 
 displayNameDesktop=Desktop
 

toolkit/modules/Troubleshoot.jsm

@@ -20,12 +20,12 @@ const PREFS_WHITELIST = [
   "apz.",
   "browser.cache.",
   "browser.display.",
+  "browser.download.confirmOpenExecutable",
   "browser.download.folderList",
   "browser.download.hide_plugins_without_extensions",
   "browser.download.importedFromSqlite",
   "browser.download.lastDir.savePerSite",
   "browser.download.manager.addToRecentDocs",
-  "browser.download.manager.alertOnEXEOpen",
   "browser.download.manager.closeWhenDone",
   "browser.download.manager.displayedHistoryDays",
   "browser.download.manager.quitBehavior",