You might want to consider something simple, like json-rpc.  There is a 
json-rpc extension that works with firefox in the Open Komodo repository 
at http://svn.openkomodo.com/openkomodo/browse/addons/sdconnector (see 
http://blogs.activestate.com/shanec/2008/05/jssh-replacemen.html) and 
you can find json-rpc modules for python by search google for "json rpc 
python".

Another option could be xml-rpc, not sure if there it a full 
implementation (both client and server) for firefox.
Shane

MOUNIR ERRAMI wrote:
>    All
>  I have a very simple question, yet I can't seem to find an answer, and I 
>  don't even think that XPCOM (and PyXPCOM) is it. Is there a way to send 
>  information from a firefox extension (i.e in javascript) to an external 
>  python program? For instance:
>  1) in javascript I add a button to a webpage with an eventListener.
>  2) onclick, some function is called. Ideally this function would send 
>  some information (a string)
>  3) a separate standalone python program (running locally, and that would 
>  have nothing to do with firefox) would be listening and would intercept 
>  the string and use it and do something with it.
>  
>  I have thought of using sockets, or writing files with javascript etc... 
>  But I am unable to find a solution of this problem. For comparison, the 
>  python win32com module allows to connect to IE. It seems that the same 
>  thing is not possible with firefox. It also seems that the starting 
>  point for inter-process communication (if possible at all with ff) would 
>  start inside an extension.
>  
>  I am not sure if I am clear or not. I would appreciate any help or 
>  pointer that could get me started.
>  
>  Thank you very much.
>  
>  M.E.
>  
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