Most of the time when you write code for a web application you need to test it again and again. You have to run a whole flow of positive or negative test cases to check whether your application is working or not.
Now suppose your application have 20 pages and you need to traverse each individual page and may be perform some operation and on each change of your development you need to perform same thing.
sometimes, this thing will irritate you and you will skip testing which may be harmful because most of the time it happens when you skipped something 
So , as a responsible developer we do not have to skip any test scenario but next question is how to reduce this effort which you feel boring sometime.
I can say we can reduce this effort by a installing a simple Firefox add-in which is absolutely free. The add in “Selenium add in”
you can download it from https://addons.mozilla.org/en-US/firefox/addon/selenium-expert-selenium-ide/
once you have installed this you will find the selenium icon near by search bar as shown below
when you click this icon you will get a selenium interface as shown below
The basic concept of this tool is what ever you will run in browser it has capability of recording those steps so it is just play button and pause button game, no rocket science. You can easily run and use this.
I am sure it will reduce your testing effort and when when selenium ide will play your test cases you can take a deep breath and enjoy your coffee and snacks.
I hope this tip may be helpful to you somewhere.
Happy Holidays.
Regards,
RJ
