Make sure the places.sqlite file exists

before loading Firefox bookmarks.

Plugins/Wox.Plugin.BrowserBookmark/ChromeBookmarks.cs

@@ -22,6 +22,7 @@ namespace Wox.Plugin.BrowserBookmark
 
         public List<Bookmark> GetBookmarks(string search = null)
         {
+            //TODO: Maybe load bookmarks here instead of pre-loading them at startup?
             if (string.IsNullOrEmpty(search)) return bookmarks;
 
             var fuzzyMatcher = FuzzyMatcher.Create(search);

Plugins/Wox.Plugin.BrowserBookmark/FirefoxBookmarks.cs

@@ -42,6 +42,10 @@ namespace Wox.Plugin.BrowserBookmark
         /// </summary>
         private List<Bookmark> GetResults(string query)
         {
+            // Return empty list if the places.sqlite file cannot be found
+            if (string.IsNullOrEmpty(PlacesPath) || !File.Exists(PlacesPath))
+                return new List<Bookmark>();
+
             // create the connection string and init the connection
             string dbPath = string.Format(dbPathFormat, PlacesPath);
             var dbConnection = new SQLiteConnection(dbPath);
@@ -66,6 +70,10 @@ namespace Wox.Plugin.BrowserBookmark
             get
             {
                 var profilesPath = Environment.ExpandEnvironmentVariables(@"%appdata%\Mozilla\Firefox\Profiles\");
+
+                // return null if the Profiles folder does not exist
+                if (!Directory.Exists(profilesPath)) return null;
+
                 var folders = new DirectoryInfo(profilesPath).GetDirectories().Select(x => x.FullName).ToList();
 
                 // Look for the default profile folder

Plugins/Wox.Plugin.BrowserBookmark/Main.cs

@@ -25,6 +25,7 @@ namespace Wox.Plugin.BrowserBookmark
 
             var returnList = new List<Bookmark>();
 
+            //TODO: Let the user select which browser's bookmarks are displayed
             // Add Firefox bookmarks
             returnList.AddRange(mozBookmarks.GetBookmarks(param, topResults));
             // Add Chrome bookmarks