To “install”, simply drag the links to your bookmarks toolbar/menu.
Dictionary
Opens in a popup window. Edit the height and width to adjust the size.
Translation
To translate to a language other than English by default, change the tl=en.
  - Translate — translate the selected text, or if there is no selection, translate the entire page via Google
 
Other sites
  - Archive — retrieve pages from or add them to the Internet Archive
 
  - old.reddit — toggle between new and old Reddit i.e. if you are on 
www.reddit.com, it will reload the same post on old.reddit.com, or vice versa. 
  - datdota — toggle between Dotabuff and datdota for a given match ID
 
Page navigation
  - up — go up one level (removes the last fragment 
#..., query ?..., or path segment /... from the current URL) 
  - [+] — increments the last number in the URL by 1. Useful for browsing blogs or webcomics with sequential post IDs
 
  - [-] — decrements the last number in the URL by 1.
 
Linking
Get the link to the current page in various syntaxes
  - link — HTML
 
  - md link — Markdown
 
  - org link — org-mode
 
  - wiki link — MediaWiki
 
  - md link — Markdown with Bugzilla support. Adds a prefix to disambiguate different BZ links (e.g. rhbz#12345 - Bug description). Currently includes rhbz, bmo, kernel, and kde. Works normally for all other URLs.