Be careful with old versions!
These versions are displayed for reference and testing purposes. You should always use the latest version of an add-on.
This issue has been fixed through this version of the add-on. You should now be able to view the latest version of the online document. (Thanks Przemek for your suggestion.)
The display message for this add-on in add-on manager within your browsers, is now just 2 lines long. Hope that helps. (Thanks Alex Essilfie for pointing this out.)
I tested this add-on for compatibility in viewing documents returned in search results of Yahoo, Bing and Google (http and https). Its works fine for search results of all the first 2 search sites. This add-on's feature is disabled on Google Search results pages by default, since it leads to broken links. Please use the "Quick View" option under the link of a document in the search results, to view the documents online (for Google Search website).
(Please let me know, if you encounter any sites, which do not require cookies/login to the view the site documents, that are broken with this add-on)