For How to use it part, please see my github repo.
Thanks @Sanjaychandak95 for updating the script.
Note : This script might not work if the leetcode site updated their frontend code.
var x = document.getElementsByTagName("tr");
var sum = x.length;
for (let i = 0; i < x.length; i++) {
if (x[i]["cells"][2]) {
if(x[i]["cells"][2].firstElementChild){
if(x[i]["cells"][2].firstElementChild.getElementsByTagName("span")){
if (x[i]["cells"][2].firstElementChild.getElementsByTagName("span")[1]) {
if (x[i]["cells"][2].firstElementChild.getElementsByTagName("span")[1].attributes[3].value === "Subscribe to unlock") {
x[i].hidden = true;
sum--
}
}
}
}
}
}
console.log(sum);