
Tab Utilities
Open Bookmarks/History/Homepage/URL/Search in new tabs, and more utilities for tabbed browsing, including open tab next, focus related/last visited tab, protect/lock/faviconize/pin tab, multiple tab handler, tab clicking options, etc.
Always open new tabs to the right of the current one(which is not the same as setting browser.tabs.insertRelatedAfterCurrent to true).
Always open new tabs to the right of the current one(which is not the same as setting browser.tabs.insertRelatedAfterCurrent to true). You can however get the default behaviour by:
configuring the + button in the tab bar to not open tabs to the right of the current one(see addon preferences) using the ctrlaltt keyboard shortcut to open a new tab
firefox-extension new-tab-page tabs tweaking firefox-tab tab-addon tabs-tweak