Hi Deepak! This seems to be a well-known and quite widespread problem with this extension, unfortunately - the net is full of complaints about this issue, not to mention 'horror stories' about how this (otherwise fairly innocent and well-certified but clearly highly commercial) extension has 'sneaked' its way into peoples installations. I find it quite amazing that such an issue has existed for so long without the Browser Highlighter, TinyMCE and FCKeditor teams getting together and making a working fix - it should be rather easy to prevent with a tag or plugin check in editor code and/or a simple editor recognition routine in the extension. If you want (/need) to use this extension, I can only point you to the Browser Highlighter homepage for support; in [http://thebrowserhighlighter.com/help.jsp The Browser Highlighter Help section] it is clearly documented - first section, last paragraph - along with a link to [http://thebrowserhighlighter.com/blacklist.jsp this problem report form] where it seems you can ask for help solving the problem. However, given the (script-)name of the page, I suppose that reporting a problem on your own website (with all details) actually adds your site - or part of it - to a blacklist that TBH maintains to turn off TBH or at least problematic script injections when visiting sites registered in this list. So actually this might help you solve the problem quite easily, if they do what the page implies. Please let us know how above works out, and if we can be of further assistance. Detailed feedback is appreciated and helps us to help you better, plus enables us to better help more users with similar problems.