Hello @stevepen
Adding do not mean that you wrote www uri to some file and this is all you need to do.
No. When you want to add some service you must first lern how this service works, check wat request it send to server what respons get, check the source code of site, java script and so on so on.
When you know this all you can wrote parser for it. You need write code in the python which will be realized the functions of web browser.
So, it is not so simple as you probably think.
I wrote this because I think many persons seems to do not know how many hard work is needed to add the new service.
Regards,
SSS