You have added the keyboard shortcut Command + K to open the search from anywhere in the browser.
But it can’t be changed in the keyboard shortcut settings, and it’s not affected if the keyboard shortcuts are disabled altogether.
This is quite annoying if you need this shortcut in other web applications.

Its really painful when I try to link something using “cmd + K” in google word. Any solution for it?

If you prefer not having the Command+K shortcut to open toby, you can turn it off by:
Chrome:
Go to chrome://extensions/shortcuts
There, you have the ability to edit your shortcuts
Firefox:
Go to about:addons
Click on the cog icon
Select Manage Extension Shortcuts
There, you’ll be able to edit your shortcuts

Thanks just did