Add-ons are software designed to work in conjunction with Internet browsers, adding new elements and functionality. Add-ons are also commonly referred to as "plug-ins," "extensions" and "mods". They are usually developed by third-party programmers, not associated with the company that makes the Internet browser. The five most popular browsers - Microsoft Internet Explorer, Mozilla Firefox, Google Chrome, Opera, and Safari - all support the use of add-ons. Enable them by following the steps related to the Internet browser of your choice.
Steps
Method 1 of 5: Microsoft Internet Explorer

Step 1. Open Microsoft Internet Explorer browser
Click on the "Tools" menu and click on "Manage add-ons".

Step 2. Click the name of the Internet Explorer add-on you want to enable
Click on "Activate" and close the tab.

Step 3. Restart your browser for the changes to take effect
Method 2 of 5: Firefox Mozilla

Step 1. Open the Mozilla Firefox browser and click on the "Tools" menu and choose the "Add-ons" item

Step 2. Click on the "Extensions" tab
Select the add-on you want to activate and click "Activate".

Step 3. Restart your browser for the changes to take effect
Method 3 of 5: Google Chrome

Step 1. Find the Google Chrome desktop shortcut and right click on it
Select "Properties".

Step 2. Click the "Link" tab
Type "- enable - extensions" in the "Destination" text box after the existing line of code, click "Apply" and then click "OK".

Step 3. Restart your browser for the changes to take effect
Method 4 of 5: Opera

Step 1. Launch Opera browser and click on "Settings"
Select "Quick Preferences".

Step 2. Check the box next to "Activate plug-in"

Step 3. Restart your browser for the changes to take effect
Method 5 of 5: Safari

Step 1. Open the Safari browser and click on the gear icon
Click on "Preferences".

Step 2. Click on the "Advanced" tab

Step 3. Click the box next to "View Developer Menu"
Close the window.

Step 4. Select the page icon and click on "Development"
Click "Enable Extensions".

Step 5. Restart your browser for the changes to take effect
Advice
- Activating add-ons in your Internet browser affects those already present. If you want to install other specific add-ons, however, you will have to download them directly from the browser website, from a third-party site or load them from the browser's Add-ons menu.
- Since in Microsoft Internet Explorer and Mozilla Firefox you can only enable certain add-ons and leave the others disabled, try to activate only the ones you use often - enabling add-ons can cause your internet browser to consume a lot of computer memory, especially if you use it for a long period of time.