For future reference:
This would be due to the Mozilla Archive Format extension. Visit the extension properties and change "Take a faithful snapshot" to "Preserve scripts and source". (Or, "Use browser save system".) This affects page saves even when you think you aren't using the MAF extension.
I noticed the same issue and did a quick search before checking extensions, just to narrow down what might be causing this. Indeed, your post is copypasta all over the internet, partly from you and partly from sites copying other sites' content. What really ruins the search, though, is all the pages online which have been saved by this method, therefore containing the noted text.
Of course Giorgio Maone is correct here.
In fact, this is the last place I would have looked for hints, but I couldn't resist visiting when I saw a result pointing to IA.
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:18.104.22.168) Gecko/20101123 Mnenhy/0.8.3 SeaMonkey/2.0.11