Browser Cookie Basics

There’s little question that a big drain on productivity is fear. Many of us tend to worry about things that are out of our control. One item that I think people worry too much about is browser cookies. Browser cookies are neither good nor bad. If you were to remove all cookies, you’d probably find your internet experiences to be less enjoyable. However, some vendors may go too far with their use of third-party cookies.

What are Browser Cookies?

A browser cookie is a small text file that a web server sends to your web browser when you request a page from a site. This text file is no larger than 4k and stores specific data elements. There is no programming code in these files. You can see a site’s cookies from within most browsers. For example, clicking the lock icon on Microsoft Edge browsers shows 19 cookies in use for the page I’m viewing. There is nothing magical about that number, and it can vary between users.

Button to see cookies in Microsoft Edge.Pin
Microsoft Edge indicating number of browser cookies

If you were to open these cookies,  you could see there is a structure that cookies share.

Each cookie has values for seven fields:

  1. Name
  2. Content or Value
  3. Domain
  4. Path (the “/” means the cookie is valid anywhere on that domain.)
  5. Send for (the connection security level)
  6. Created
  7. Expires
Cookie structure as shown in Microsoft EdgePin
Details of browser cookie structure in Microsoft Edge

The picture above is for an Intercom chat cookie on this site. However, if you were to do this exercise, you would not see this cookie. It’s set because I am logged into WordPress, and my hosting provider uses Intercom for support issues.

How Do I get Web Cookies?

One question people often ask is how they even got these cookies. This is all handled on the backend between your web browser and the server of the website you’re visiting. When you request a page from a site such as ours, the web server looks for cookies from our domain on your computer. In the screen print above, you can see a field where the domain name is captured.

Our web server only reads cookies that match For example, our server couldn’t read your New York Times cookies, and the New York Times servers couldn’t read the cookies.

If the webserver finds its domain cookies, it will use them. If it doesn’t find any cookies, it will create them. Your web browser can control this as you may prevent cookies. Some people also have software programs that manage cookies.

To give an example, if this was the first time you came to this site, you saw a cookie banner. Based on your selection, a cookie was set with your preference. When you return to the site, the browser looks for this cookie. If you deleted it, you would be greeted with the cookie banner again.

There are some important differences between cookies based on expiration and domain. A web server can issue two types of cookies based on time, called session cookies and persistent cookies. Cookies that expire once you log off or close the browser are called session cookies. These all display “session” under the Expires column. Online shopping carts may use session cookies to track items in your basket. These cookies are stored in memory and not on your hard drive.

A persistent cookie is one, which has a date expiration. The webserver issues the expiration date. In the example above, you can see our Intercom cookie is a persistent cookie that lasts a week.  In some cases, persistent cookies are set for a very long time. These types of cookies can help track logged-in users.

Aside from expiration, there is another distinction based on domain. Again, looking at the screen snap, you can see that the Intercom cookie shows a domain of If the domain name in the Domain field matches the issuing site’s domain name, it is known as a First Party cookie. These tend to be trusted cookies as you have a relationship to the site unless some spyware or Adware has infected you.

If you were on our site and served a cookie from, that would be considered a Third-Party cookie. You generally don’t have a relationship with this company. These types of cookies are often scrutinized as people want to know who is this other company. In some cases, there is a relationship with the company. For example, if this site were part of a publishing company with many properties, the server might issue a third-party cookie in the parent company’s name, such as Other examples might be cookies issued by a web analytics company on behalf of the site you’ve visited.

One type of third-party cookie that raises eyebrows belongs to ad networks. Some websites, such as ours, use the services of ad networks. These sites may set a third-party cookie that other member sites can read to deliver the ads.

Why Cookies are Used

While many people equate cookies to ad delivery or tracking, they can do more. Cookies are also used to:

  • personalize a site
  • authenticate you to a site requiring a username
  • maintain shopping cart status
  • track affiliate leads
  • analyze web traffic

This site sets cookies for personalization and analytics purposes. On my previous content management system (CMS),  you could see a cookie named “fontSize.” This was an example of a cookie offering personalization based on the user wanting larger or smaller display font sizes. Some sites do something similar with “dark theme” vs. “light theme.”

The part that often scares people is the web analysis. In our case, the bottom four cookies starting with an underscore are used for web analysis. Some people mistakenly think that cookies allow web admins or some entity to track all your movements throughout the web. They believe the moment you leave my site, I alert Amazon and tell them you’re on your way to buy that book on Microsoft Outlook. At the same time, Google tells me that you’re heading my way to read about an Excel tip.

Like most stories, there is some truth to the one above. I can tell if a reader was referred to this site by Google. But it’s not a cookie that tells me that info. That’s just part of the information written to web server logs. In recent years, Apple and Google have been limiting what webmasters and marketers can see.

Where to Find Browser Cookies

Your browser only saves persistent cookies in a specific location. This is why some sites look different in different browsers. You may have set your personalization for a site using Firefox but not done the same exercise using Google Chrome. Cookies are not shared across browsers. If you set your cookie preference using Firefox, the cookie would not carry over to Google Chrome. The same rule applies if you delete cookies too.

Here are the address bar commands to bring up all cookies.

Microsoft Edge

In your address bar, type :


Google Chrome

In your address bar, type:


You can see more info in our deleting Chrome cookies tutorial.

Mozilla Firefox

In your address bar, type:


And then click Manage Data…

Internet Explorer

If you’re still using Internet Explorer, you will have a separate cookies folder containing all your items. However, you’ll need to change your folder options so you can see hidden system files. This folder is found at:

C:\Users\{User Name]\AppData\Roaming\Microsoft\Windows

One item that scares people with Internet Explorer is the cookie name includes your username. For example, the cookie for our site might show as This user name, “jr.” does not get sent to a server. This is Microsoft’s way of separating multiple users on one computer.

Personally, I don’t worry about first-party cookies if I know the domain. Hopefully, someone on the other end of the equation reading their web analytics will make good decisions based on what they’re seeing. I know I look at the data as it helps me see what people are interested in learning. I’m less likely to keep a third-party cookie and often try to find out more.