There was a plug in for firefox which made Thai language script on webpages larger if you right clicked and selected the option. It was called Large Thai Script. It is no longer compatible with firefox as of version 49
I have just found an alternative called LargeThai (oneword). It claims to be an update of the earlier software and lists esoteric software as the developer. Your website doesn't make any mention of it and nothing relevent is returned by searches on your site.
I'm just here to ask whether this plugin is kosher and actually made/managed by you, or is it ไหม่ดี and going to make my computer ill ?