Add executable permission for a file in SVN:

svn propset svn:executable '*' file_name

PDF viewer in chrome:
1. install mozplugger 1.13.2 (http://mozplugger.mozdev.org/)
make linux libprefix=/lib64
make install libprefix=/lib64
2. delete nppdf.so under /usr/lib/mozila, /usr/lib64/mozila
3. retart chrome

Add ed2k links with amule in brower:
http://wiki.amule.org/index.php/Ed2k_links_handling

Sigh, chrome doesn't work, which can't properly decode ed2k protocol: (http://code.google.com/p/chromium/issues/detail?id=160#c54). A niggling bug, finally fixed after 1 one year later...