[Greasemonkey] Checking for Greasemonkey

[Vectorspace]

Jeremy Dunck wrote:
> On 4/19/06, Piotr 'xavier' Zierhoffer <piotr.zierhoffer at gmail.com> wrote:
>   
>> Is it possible to check if a visitor on my website is using Greasemonkey
>> with script affecting it? If yes - can I chceck what is this script doing?
>>     
>
> You can observe indirectly for DOM mutations, but otherwise, no.
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>   
And DOM mutations can be caused by things other than Greasemonkey - 
bookmarklets, extensions...