Rewrite after the Disqus changes. Saving to localstorage is broken for some reason.
The new Disqus system that Spectrum uses requires that the extension target disqus.com. This generalizes the extension to EVERY Disqus website. It's almost working completely. Does not correctly collapse comments that have a "read more" tag.
The extension is now an extension for the disqus.com domain and should work with any website using the disqus commenting system. Disqus-specific magic strings were factored out into "constants".