Hi sijad
First up thanks for a great little extension have it working on beta 5 after updating composer however the arrow for the spoiled text isn't really that good and doesn't indicate to the uninitiated that it's spoiler content IMO. Be nice if we could format it to however we'd like it, traditionally with other boards if there's no title it just says spoilered or similar.
Additionally if the spoiler is titled it shows a faded broken line below the title which becomes solid when hovered over and goes back to faded when the spoiled content is displayed.