Cofo PH & PC (Cofo Problem hider and problem chooser)
Download it from Github.
Cofo problem hider and problem chooser : hide solved problems in codeforces problemset page !!!!! and randomly choose problems with rate that you say that you dont solved it yet !!!e
use "Load Unpacked" to install it !
Install the chrome extention and once Enter your UserName and change theme between black and white
Enter two numbers then extension will choose a unsolved problem between the numbers and open it in a new tab !
note : if you don't enter your username the extention will suggest a random problem and dont care about you solved it or not!
Now no need to explore problemset page for a new problem just enter 2 numbers !!!!!!!!!!
And the second feature hide unsolved problem in problemset page again make the upsolving easier
Before Click :
After Click :
Good Luck & Have Fun
UPD : Added problem chooser for atcoder !!!!!
Donwload it from Github
use it for atcoder !