Include the CSS from the windows version of Firefox to dupicate the s…

…ame styling of the chrome notification since this file is absent on OSX.

CREDITS

@@ -20,5 +20,5 @@ Firefox ( http://mozilla.org/ ), reused under the MPL license; see the
 LICENSE.mpl file.
 
 All MPL code is located in the content/third-party/ and modules/third-party/
-directories, and all such files contain the appropriate licensing disclaimers
-and notifications.
+and skin/third-party/ directories, and all such files contain the appropriate
+licensing disclaimers and notifications.

chrome.manifest

@@ -13,6 +13,7 @@ skin       greasemonkey classic/1.0 skin/
 overlay	   chrome://browser/content/browser.xul chrome://greasemonkey/content/browser.xul
 style      chrome://browser/content/browser.xul chrome://greasemonkey/skin/browser-mac3.css os=Darwin appversion<4.0
 style      chrome://browser/content/browser.xul chrome://greasemonkey/skin/browser-mac.css os=Darwin appversion>=4.0b1
+style      chrome://global/content/alerts/alert.xul chrome://greasemonkey/skin/third-party/alert.css os=Darwin
 style      chrome://global/content/customizeToolbar.xul chrome://greasemonkey/skin/browser.css
 overlay	   chrome://browser/content/browser.xul chrome://greasemonkey/content/statusbar.xul appversion<4.0