Refer to firefox add-on ID as unique identifier

Author: RenderMichael

dotnet/src/webdriver/Firefox/FirefoxDriver.cs

@@ -288,7 +288,7 @@ public void SetContext(FirefoxCommandContext context)
         /// </summary>
         /// <param name="addOnDirectoryToInstall">Full path of the directory of the add-on to install.</param>
         /// <param name="temporary">Whether the add-on is temporary; required for unsigned add-ons.</param>
-        /// <returns>The add-on ID.</returns>
+        /// <returns>The unique identifier of the installed add-on.</returns>
         /// <exception cref="ArgumentNullException">If <paramref name="addOnDirectoryToInstall"/> is null or empty.</exception>
         /// <exception cref="ArgumentException">If the directory at <paramref name="addOnDirectoryToInstall"/> does not exist.</exception>
         public string InstallAddOnFromDirectory(string addOnDirectoryToInstall, bool temporary = false)
@@ -314,7 +314,7 @@ public string InstallAddOnFromDirectory(string addOnDirectoryToInstall, bool tem
         /// </summary>
         /// <param name="addOnFileToInstall">Full path and file name of the add-on to install.</param>
         /// <param name="temporary">Whether the add-on is temporary; required for unsigned add-ons.</param>
-        /// <returns>The add-on ID.</returns>
+        /// <returns>The unique identifier of the installed add-on.</returns>
         /// <exception cref="ArgumentNullException">
         /// <para>If <paramref name="addOnFileToInstall"/> is null or empty.</para>
         /// or
@@ -343,7 +343,7 @@ public string InstallAddOnFromFile(string addOnFileToInstall, bool temporary = f
         /// </summary>
         /// <param name="base64EncodedAddOn">The base64-encoded string representation of the add-on binary.</param>
         /// <param name="temporary">Whether the add-on is temporary; required for unsigned add-ons.</param>
-        /// <returns>The add-on ID.</returns>
+        /// <returns>The unique identifier of the installed add-on.</returns>
         /// <exception cref="ArgumentNullException">If <paramref name="base64EncodedAddOn"/> is null or empty.</exception>
         public string InstallAddOn(string base64EncodedAddOn, bool temporary = false)
         {