Firefox Extension - Subreddit name display

Reddit ([login to view URL]) is an American social news aggregation, web content rating, and discussion website. I use a Firefox browser extension, named, 'Reddit Enhancement Suite' ([login to view URL]), which adds a variety of features for browsing Reddit. One of them is called, 'Never Ending Reddit', which automatically loads content. When browsing through a Reddit page, it loads the first 100 records (a record can be either a comment made by the user, or a post created by the user), then as you scroll down, and hit the end of the 100 records, it loads the next 100 records, and so on. What I would like is an extension that will work with Reddit Enhancement Suite, and will display the unique subreddits a user has commented or posted in. A subreddit is a specific online community, and the posts associated with it, on the social media website Reddit. Subreddits are dedicated to a particular topic that people write about, and they're denoted by /r/, followed by the subreddit's name, e.g., /r/gaming. Each user's history is viewable by typing '[login to view URL]' and adding their user name. For example, user 'Finear' [login to view URL] What I would like is an extension that will work with Reddit Enhancement Suite, and will display the unique subreddits that a user has posted in. I would want a button, or some way to activate the extension. I have saved all of the comments and posts displayed on Finear's user page, in a Web Page complete document, named 'overview for Finear - all comments' Note: I don't provide this file because I plan to use the extension on it. I am providing the file to show the data used to generate the subreddits listed in this project, since as the Finear user adds comments and posts, the older comments may 'fall off' the list, as there is a maxium number of comments/posts displayed (regardless of how many actually exist). So, what I am saying here is that the saved web page may not exactly match the actual web page. When I manually extract all the URLs from the /user/Finear page to get the subreddits, I get the following UNIQUE subreddit list for Finear: all Amd ArmoredWarfare battlefield_4 classicwow CompetitiveWoW Dashboard DotA2 Dota2Trade Enhancement friends intel leagueoflegends mod MTB myrandom NSFW_GIF NZXT popular random TankPorn tipofmyjoystick titanfall Warthunder WorldofTanks WorldofWarplanes WorldOfWarships wow I want a pop-up to display a list of these unique subreddit records, in alphabetical order, each of which would function as a hyperlink. See the example of how I want it to work/look, in the document named 'Finear - [login to view URL]'. I want the pop-up to remain on the screen, until closed with 'X' option in the top-right-hand corner of the pop-up. That is, as I scroll up or down the page, the pop-up window should remain in the same position. On the pop-up, if I selected 'DotA2', I want it do two things: 1. Open a new tab in Firefox and load '[login to view URL]' 2. Copy 'DotA2' to the copy cache (so if I went into another application, I could select CTRL-V and it would paste, 'DotA2'). I also need an exclusion ability where I would enter in a list of excluded subreddits. For example, if I entered in the following subreddits in the exclusion list: all, friends, mod, myrandom, popular, random The display for the Finear user would show: Amd ArmoredWarfare battlefield_4 classicwow CompetitiveWoW Dashboard DotA2 Dota2Trade Enhancement intel leagueoflegends MTB NSFW_GIF NZXT TankPorn tipofmyjoystick titanfall Warthunder WorldofTanks WorldofWarplanes WorldOfWarships wow I need the extension to be signed so that it can be permanently installed. I need the excluded subreddit list to be saved so that it is usable if the Firefox browser is closed, then reopened.