Not a sustainable solution, but you might wanna download a session manager and periodically just save the current session and start with a fresh one. No loss of

Not a sustainable solution, but you might wanna download a session manager and periodically just save the current session and start with a fresh one. No loss of data, no perpetual accumulation of tabs. Also use a service such as Firefox Pocket or Pinboard to boomark tabs which then can be instantly closed.