Click the menu button to open the menu panel. Click Bookmarks and then click the Manage bookmarks bar at the bottom. In the left pane, click on the folder you want to view. Its contents will appear in the right pane. In the right pane, click to select the item you want to delete. Hold down the CTRL key to select more than one item.
8. There is now a proper solution (Firefox v40): places.history.expiration.max_pages will override the 'optimal database size' calculations, so setting it to a large positive value should get the desired effect. See this answer. Share.
QpS4p. firefox can t delete history
