Can I write an extension to change the subject line of rss

Is it technically possible to write an extension to change the subject
line of RSS feeds? either XUL or post XUL. I have started to go through
the guide for writing extensions but I don't want to go to all the
trouble and then find what I am doing is impossible.
0
Richmond
10/5/2018 10:31:44 AM
mozilla.support.seamonkey 12963 articles. 0 followers. Post Follow

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