Hi, I've recently released Did It Tera? for Chrome. It's a simple extension which adds an info text under the opponent's team with the name and type of the terastallized Pokémon. It has an option page where you can customize the font size (between 11 and 13px) and color.
Details:
I've released the code here. I'm using 2 MutationObservers, 1 which checks for new rooms and 1 which checks for the tera text, as soon as the tera text appears I use those info to create the label and disconnect the observer.
I've used it for some time and I haven't noticed issues but let me know in case you find any bug (maybe related to the label position) and I'll fix them.
Details:
I've released the code here. I'm using 2 MutationObservers, 1 which checks for new rooms and 1 which checks for the tera text, as soon as the tera text appears I use those info to create the label and disconnect the observer.
I've used it for some time and I haven't noticed issues but let me know in case you find any bug (maybe related to the label position) and I'll fix them.