Hello LeetCoders,
We all know that LeetCode shows solved count of problems for each difficulty in the profile page(leetcode.com/<user_name>) however this exact feature is not available for tags(leetcode.com/tag/<tag_name>).
Someone who's practicing topic-wise might have noticed this too. So, I decided to build a web extension for the same purpose(displaying solved count for each difficulty for any tag).
I present you with leetcode-ac-count, a web extension that displays solved count for each difficulty of any tag.
As the name suggests, it just counts and displays the number of ACs(Accepted problems) under any tag. For example, after installing the extension, if you go to the Stack tag, it displays your solved count for the Stack tag like shown in the image below:

As of now the extension is only available in the Firefox Browser Add Ons. But, the extension is built to support both Mozilla Firefox and Google Chrome.
For installing on Google Chrome, refer the repository page on GitHub.
Project Repository (has instructions to install the extension on google chrome):
Download Link (for Firefox)
I'm looking forward to introduce more features and improve the UI of stats in the future.
If you have any suggestions or feedback, please leave them in the comments!
I hope you like and enjoy the extension!
Happy LeetCoding!