This plugin does 2 things and 2 things only

1. Sets the filetype as browserslist for browserslist's config files
2. Syntax highlighting

Install using your favorite plugin manager. Below is an example using vim-plug:

Plug 'browserslist/vim-browserslist'

• browserslistComment
• browserslistKeyword
• browserslistVersion
• browserslistMarketshare
• browserslistDate
• browserslistConfig
• browserslistSection
• browserslistTarget
• browserslistCountry