favicon-extension broken by invalid character in python source

Binary package hint: epiphany-extensions

When starting epiphany-browser with the favicon-extension the extension does not load with the following error message on the console:

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  File "/usr/lib/epiphany/2.17/extensions/favicon.py", line 3
SyntaxError: Non-ASCII character '\xc2' in file /usr/lib/epiphany/2.17/extensions/favicon.py on line 3, but no encoding declared; see http://www.python.org/peps/pep-0263.html for details

** (epiphany:23249): WARNING **: Could not initialize Python module 'favicon'
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It's the copyright character in the GPL note at the beginning of the file that is causing this error.
The solution is trivial: either replace the copyright-character by "(c)" or add the line

# -*- coding: utf-8 -*-

right after the shebang.