Open Chrome.
Click on the button with three horizontal lines 
or the three dots 
found in the upper right-hand corner of your Chrome browser.
From the drop-down menu click More Tools > Extensions.
Next to the extension you want to remove, click Remove 
If you simply want to hide the extension but not remove it, you can un-check the Enabled button.
Restart Chrome.
Open Firefox
Go to the Firefox menu located in the top right of your Firefox browser window
Select Add-ons to open the Add-ons Manager 
Under 
click the name of the add-on that you would like to disable or remove
Select Disable or Remove
Restart Firefox
Open Opera.
Go to the Red icon menu located at the top left of your opera browser window.
Select Extensions > Manage Extensions.
All installed extensions for Opera will appear here.
Select Disable or Remove
Restart Opera.
Open Safari
Select the Safari dropdown menu > Preferences
Choose Extensions
Find the plugins you want to remove, click the Uninstall button.
Restart Safari.