Update README.md (#18)

Author: kfarnung

README.md

@@ -1,17 +1,18 @@
 # Advent of Code to Markdown
+
 Converts a given [Advent of Code](https://adventofcode.com) page to a
 GitHub-compatible Markdown file.
 
-## Installing
+## Install
 
 ### Firefox
 
-Binaries are available on the [Releases](https://github.com/kfarnung/aoc-to-markdown/releases) page.
+Install from [Add-ons for Firefox](https://addons.mozilla.org/en-US/firefox/addon/aoc-to-markdown/).
 
-### Chrome
+### Chrome/Edge
 
-The extension must be side-loaded using developer mode.
+Install from the [Chrome Web Store](https://chrome.google.com/webstore/detail/advent-of-code-to-markdow/bhhioamnpnhgcakbdnkgmnjjbjolfjmj).
 
-## Building
+## Build
 
 See [BUILDING.md](BUILDING.md) for detailed instructions.