or via stylus

new style for feed -> paste:

[data-testid="mainFeed"]{display:none}

in full:

/* ==UserStyle==

@name www.linkedin.com/feed

@namespace github.com/openstyles/stylus

@version 1.0.0

@description A new userstyle

@author Me

==/UserStyle== */

@-moz-document url-prefix("https://www.linkedin.com/feed/")

{

    [data-testid="mainFeed"]{display:none}

}