Fix Github, Twitter and Google+ icon bug

drivers/firefox/content/xul/wappalyzer.xul

@@ -30,9 +30,9 @@
 
 						<menuseparator/>
 
-						<menuitem id="wappalyzer-menu-github"     label="&wappalyzer.github;"  image="chrome://wappalyzer/skin/images/github.ico"  class="menuitem-iconic"/>
-						<menuitem id="wappalyzer-menu-twitter"    label="&wappalyzer.twitter;" image="chrome://wappalyzer/skin/images/twitter.ico" class="menuitem-iconic"/>
-						<menuitem id="wappalyzer-menu-gplus"      label="&wappalyzer.gplus;"   image="chrome://wappalyzer/skin/images/gplus.ico"   class="menuitem-iconic"/>
+						<menuitem id="wappalyzer-menu-github"     label="&wappalyzer.github;"  image="chrome://wappalyzer/skin/images/github.png"  class="menuitem-iconic"/>
+						<menuitem id="wappalyzer-menu-twitter"    label="&wappalyzer.twitter;" image="chrome://wappalyzer/skin/images/twitter.png" class="menuitem-iconic"/>
+						<menuitem id="wappalyzer-menu-gplus"      label="&wappalyzer.gplus;"   image="chrome://wappalyzer/skin/images/gplus.png"   class="menuitem-iconic"/>
 					</menupopup>
 				</menu>