JavaScript frameworks
Who left ef.js, and who still runs it
7 websites in the top 1M run ef.js, observed directly from the rendered page in the July 2026 crawl.
2
stopped running it that month
0
of those are 11–500 employees
7
adopted it in the last year
Confirmed across two consecutive crawls, not a single month. Build the list →
Some companies running ef.js
Every row in a full list carries the prospect's whole detected stack.
Not currently available as a list.
What else they run
jQuery 100%jQuery UI 71%Bootstrap 57%Font Awesome 57%jQuery Migrate 57%Cloudflare 43%Amazon Web Services 43%PHP 43%Debian 43%Apache HTTP Server 43%
Share of a 7-domain sample of ef.js users that also run each.