Removing the Close button(x) on Tabs

bvfi-dev

bvfi-dev

Im trynna remove the close button on tabs, because when there are 100 tabs its hard to click it. I use MMB to close it anyways. I've got this so far

{
	"manifest_version": 3,

	"name": "Remove X on tabs",
	"description": "Remove the X on tab",
	"version": "1.0",
	"content_scripts": [{
        "matches": ["<all_urls>"],
        "css": ["default.css"]
    }]
}

default.css

.tab-close { display: none !important; }

I have no idea whats the class name or how I can do this, but I think this code is pretty self explanatory of what I want to do. If anyone has any clue of how I can achieve this, help me out.