it doesnt work, I dont have the option to put the second subtitle... I dont put 1 star to support you, I would really like it to work
if you fix it i'll change my rating

edit : I dont know how to reply to you so here is what you requested, hopefully you will see it

Firefox 93.0 / 64bits
Windows 7

edit : it still doesn't work but the developer is very nice, i put my rating up to 4 stars