Submitify plugin for codeforces- which allows us to submit code from Problem page itself.
- Download this repository.
- Extract the zip files.
- Go to chrome://extensions/ from the browser.
- Turn on Developer mode.
- Click on load unpacked and select the extracted folder having the manifest.json file.
- Download from here : https://addons.mozilla.org/en-US/firefox/addon/submitify/
- Download this repository.
- Extract the zip files.
- Open the .crx file in the Opera folder using Opera browser.