Hello Mark Craig,

I'm the creator of LessPass.

I use the application every day. So I'm evolving the code to fix all the problems and make the improvements that the community requires. I'm not that young, I'm over 30 :)
Yes nobody knows what the future is. But LessPass has many years ahead of him. I have not planned to stop using it, nor to develop on it. Edouard team member and I are working to make the community grow, to make the product last in time.

Normally LessPass use last webextension API so it will works with Firefox 54. Feel free to add an issue on Github if you encounter some errors.

Thank you for raising your concerns
Best