Used Search Keys for Windows?
The Download Now link will prompt a local download of the Firefox extension. To install the extension directly, open the file using your Firefox browser.
Developer’s Description
Search Keys lets you go to search results by pressing the number of the search result instead of clicking. For example, pressing 1 takes you to the first result. Hold Alt (Windows/Mac) or Ctrl (Linux) to open results in new tabs, or Shift to open results in new windows. This extension can save you time because your hands are usually on the keyboard after you enter a search.
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