Why I am not able to commit any repository in github?

I have many private repositories on my GitHub. Until yesterday I was able to commit to any repository on my GitHub. But today, I am trying to change the readme.md file in my repository, I am not able to see the preview and also not able to commit as the commit button is disabled.

Actually, later I saw that I am unable to commit any file in chrome browser only , but I can commit any file in other browser (Microsoft Edge) . And also, I am able to commit from my IDE (MS Visual Studio) . So, My question is that , why I am unable to commit from Chrome only.

I found solution for this problem: Problem is occurring due to I Added extension in chrome i.e. ad blocker extension. So, I removed that extension and problem is solved.