A couple of other articles have covered extensions that enable you to search Opera and Google Chrome tabs. Firefox users can also search their open tabs with Tabby2. This extension adds a vertical tab list and search box to Firefox.
Open the Tabby2 page to add this one to Firefox, and then restart the browser. If there isn’t a Tabby2 button on your toolbar, click Open menu > Customize. Then drag the Tabby2 button onto the toolbar as below.
Open the Add-ons page by selecting Open menu > Add-ons. Press Options beside Tabby2 to open its setting window. That window includes a list of the extension’s shortcut keys. You can also customize the hotkey that opens the tab list. Press OK to apply the settings and close window.