Version 1.9:

If you press a hotkey while already on a tab matched by that hotkey, the following new behaviour has been added:
If there is only one matching tab open, Firefox will change to your last used tab.
If there are multiple matching tabs open, Firefox will move between the matching tabs.

Options to edit the default hotkeys have been added for users of firefox 60 and above.

New Features:

• Select last open matching page
  When multiple open pages match the search term, the option is now available to select the most recently opened tab.
• RegEx matching now supported
  You can now match tabs with Regular Expressions while specifying the url to visit if no match is found.
• Detects if current selected tab is blank
  If the active tab is a blank new tab page, instead of opening the page in a new tab the page will be opened in the current tab.
• Also changed version numbering to better reflect type of release.

Important Changes:

• Tab switching reverted to version 0.1.5 style
  'Switch/Open Site' will match any url that contains the search url within it.
  'Switch/Open page' will only match a url that is an exact match of the search url.

Please report any bugs or feature requests to hotkeytabs@gmail.com