Are we e10s yet?

Planning to retire this site

By the time Firefox 57 comes out, all add-ons will be using WebExtensions, currently Firefox 55 is in Nightly. There isn't really much work being done on e10s for add-ons any more, all resources are focused on moving to WebExtensions. WebExtensions work in multi-process Firefox. As we get into the Firefox 56 cycle, this site will stop updating and be deleted not long after that.


E10s runs web related content in background child processes.

Are you a Firefox user?

Probably the best way to test if your add-ons work with e10s is to use the Add-on Compatibility Reporter which will tell you if your add-ons are multi-process compatible and let you tell the developer how well they work. See this blog post for more.

Are you an add-on developer?

Check out the compatibility reports (go to AMO developer hub > compatability) for your add-on to see the reports that people have been sending. What follows on this page may be useful to you, but maybe not.

What is this page?

This page is primarily a report of the add-on status by combining reports from AMO (which are public) and Telemetry (which are not) to produce one list. Just because add-ons are listed or not listed here doesn't mean it gets special treatment.

Here to test an add-on?

Please use the Add-on Compatibility Reporter as mentioned above.

# Overall reports

compatible 1,272
compatible-webextension 3,323
unknown 16,674
undefined 48
incompatible 52

Note: these are listed add-ons on AMO only. Hopefully unlisted can come soon. "undefined" refers to an error in the report. Other statuses are documented.

# Top add-on list

As ranked by number of users.

Name Compatible? [1] Shims [2] CPOW [3] Bugs [4] Featured? [5]
# Adblock Plus
{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d} • 20,619,547 users
compatible 
Version Used
2.9.1.4257-beta No
2.9 No
2.9.1 No
2.8.2 No
2.9.1.4258-beta No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
2.9.1.4257-beta 0.00 0
2.9.1 0.00 0
2.8.2 0.00 0
2.9 0.00 0
2.9.1.4258-beta 0.00 0
# Video DownloadHelper
{b9db16a4-6edc-47ec-a1f4-b86292ed211d} • 4,452,660 users
compatible 
Version Used
6.3.1 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
6.3.1 0.00 0
# Easy Screenshot
easyscreenshot@mozillaonline.com • 2,403,045 users
compatible 
Version Used
2.53 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
2.53 0.00 0
# NoScript Security Suite
{73a6fe31-595d-460b-a920-fcc0f8843232} • 2,146,154 users
compatible 
Version Used
5.0.6rc4 No
5.0.5 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
5.0.6rc4 0.00 0
5.0.5 0.00 0
# Ghostery
firefox@ghostery.com • 1,464,992 users
compatible-webextension 
Version Used
7.1.3.1 No
7.2.2 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
7.1.3.1 0.00 0
7.2.2 0.00 0
# Greasemonkey
{e4a8a97b-f2ed-450b-b12d-ee082ba24781} • 1,302,204 users
compatible 
Version Used
3.11 No
3.11beta1 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
3.11 0.00 0
3.11beta1 0.00 0
# DownThemAll!
{DDC359D1-844A-42a7-9AA1-88A850A938A8} • 1,294,978 users
compatible 
Version Used
3.0.8 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
3.0.8 0.00 0
# uBlock Origin
uBlock0@raymondhill.net • 1,154,406 users
compatible 
Version Used
1.13.3b2 No
1.13.3b1 No
1.12.5rc2 No
1.12.5rc3 No
1.13.0 No
1.12.5rc5 No
1.12.5rc4 No
1.12.4 No
1.12.1 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
1.13.3b2 0.00 0
1.13.3b1 0.00 0
1.12.5rc2 0.00 0
1.12.5rc3 0.00 0
1.13.0 0.00 0
1.12.5rc5 0.00 0
1.12.5rc4 0.00 0
1.12.4 0.00 0
1.12.1 0.00 0
# Download YouTube Videos as MP4
{b9bfaf1c-a63f-47cd-8b9a-29526ced9060} • 1,075,158 users
compatible 
Version Used
1.8.10 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
1.8.10 0.00 0
# Flash Video Downloader - YouTube HD Download [4K]
artur.dubovoy@gmail.com • 1,066,245 users
compatible 
Version Used
15.0.15 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
15.0.15 0.00 0
# FlashGot Mass Downloader
{19503e42-ca3c-4c27-b1e2-9cdb2170ee34} • 848,724 users
unknown 
Version Used
1.5.6.14 Yes
Version Avg blocking CPOW calls per session hour Avg ms per blocking
1.5.6.14 0.00 0
# Tab Mix Plus
{dc572301-7619-498c-a57d-39143191b318} • 842,022 users
compatible 
Version Used
0.5.0.3 No
0.5.0.4pre.170525a1 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
0.5.0.3 0.00 0
0.5.0.4pre.170525a1 0.00 0
# Google Translator for Firefox
translator@zoli.bod • 798,165 users
incompatible 
# LastPass Password Manager
support@lastpass.com • 745,753 users
compatible 
Version Used
4.1.53 No
4.1.53a No
4.1.54a No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
4.1.53 0.00 0
4.1.53a 0.00 0
4.1.54a 0.00 0
# YouTube™ Video and Audio Downloader
feca4b87-3be4-43da-a1b1-137c24220968@jetpack • 727,036 users
compatible 
Version Used
0.5.9 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
0.5.9 0.00 0
# Yahoo Toolbar and New Tab
{635abd67-4fe9-1b23-4f01-e679fa7484c1} • 716,458 users
unknown 
# 1-Click YouTube Video Download
YoutubeDownloader@PeterOlayev.com • 694,409 users
compatible 
# Download Flash and Video
{bee6eb20-01e0-ebd1-da83-080329fb9a3a} • 682,182 users
compatible 
Version Used
2.06 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
2.06 0.00 0
# Element Hiding Helper for Adblock Plus
elemhidehelper@adblockplus.org • 655,424 users
compatible 
Version Used
1.4 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
1.4 0.00 0
# Flashblock
{3d7eb24f-2740-49df-8937-200b1cc08f8a} • 595,268 users
unknown 
# Search and New Tab by Yahoo
jid1-16aeif9OQIRKxA@jetpack • 582,449 users
unknown 
# anonymoX
client@anonymox.net • 549,250 users
compatible 
Version Used
3.2 No
3.0 No
3.1 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
3.2 0.00 0
3.0 0.00 0
3.1 0.00 0
# Flagfox
{1018e4d6-728f-4b20-ad56-37578a4de76b} • 525,145 users
compatible 
Version Used
5.1.23 No
5.1.24 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
5.1.23 0.00 0
5.1.24 0.00 0
# IE Tab V2 (Enhanced IE Tab)
{1BC9BA34-1EED-42ca-A505-6D2F1A935BBB} • 515,934 users
unknown 
# YouTube mp3
info@youtube-mp3.org • 514,302 users
unknown 
# Lightbeam for Firefox
jid1-F9UJ2thwoAm5gQ@jetpack • 509,680 users
compatible 
Version Used
1.3.2 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
1.3.2 0.00 0
Yes
# Web Developer
{c45c406e-ab73-11d8-be73-000a95be3b12} • 493,583 users
incompatible 
# FireFTP
{a7c6cf7f-112c-4500-a7ea-39801a327e5f} • 490,402 users
compatible 
Version Used
2.0.31 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
2.0.31 0.00 0
# Stylish
{46551EC9-40F0-4e47-8E18-8E5CF550CFB8} • 481,414 users
compatible 
Version Used
2.0.7 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
2.0.7 0.00 0
Yes
# BetterPrivacy-signed
{d40f5e7b-d2cf-4856-b441-cc613eeffbe3} • 480,695 users
compatible 
Version Used
1.77 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
1.77 0.00 0
# Yandex.Bar
yasearch@yandex.ru • 452,947 users
unknown 
# Classic Theme Restorer
ClassicThemeRestorer@ArisT2Noia4dev • 436,611 users
compatible 
Version Used
1.6.8beta5 No
1.6.8beta4 No
1.6.8beta1 No
1.6.7beta12 No
1.6.7beta13 No
1.6.7beta11 No
1.6.6 No
1.6.7 No
1.6.7beta14 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
1.6.8beta5 0.00 0
1.6.8beta4 0.00 0
1.6.8beta1 0.00 0
1.6.7beta12 0.00 0
1.6.7beta13 0.00 0
1.6.7beta11 0.00 0
1.6.6 0.00 0
1.6.7 0.00 0
1.6.7beta14 0.00 0
# EPUBReader
{5384767E-00D9-40E9-B72F-9CC39D655D6F} • 424,322 users
compatible-webextension 
Version Used
2.0.4 No
2.0.3 No
2.0.2 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
2.0.4 0.00 0
2.0.3 0.00 0
2.0.2 0.00 0
# Garmin Communicator
{195A3098-0BD5-4e90-AE22-BA1C540AFD1E} • 418,313 users
unknown 
# Ant Video Downloader
anttoolbar@ant.com • 407,227 users
incompatible 
# YouTube Flash Player
jid1-HAV2inXAnQPIeA@jetpack • 402,546 users
compatible 
Version Used
1.8.0 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
1.8.0 0.00 0
# iMacros for Firefox
{81BF1D23-5F17-408D-AC6B-BD6DF7CAF670} • 397,613 users
compatible 
Version Used
9.0.3 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
9.0.3 0.00 0
# Evernote Web Clipper
{E0B8C461-F8FB-49b4-8373-FE32E9252800} • 391,479 users
compatible-webextension 
Version Used
6.12.1.1 No
6.10.2.0 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
6.12.1.1 0.00 0
6.10.2.0 0.00 0
# iCloud Bookmarks
firefoxdav@icloud.com • 383,932 users
compatible 
# Speed Dial
{64161300-e22b-11db-8314-0800200c9a66} • 378,805 users
unknown 
# S3.Google Translator
s3google@translator • 369,330 users
incompatible 
Version Used
5.32 Yes
Version Avg blocking CPOW calls per session hour Avg ms per blocking
5.32 0.00 0
# FireGestures
firegestures@xuldev.org • 363,752 users
compatible 
Version Used
1.11.1 No
1.11 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
1.11.1 0.00 0
1.11 0.00 0
# AdBlocker Ultimate
adblockultimate@adblockultimate.net • 357,692 users
unknown 
# ImportExportTools
{3ed8cc52-86fc-4613-9026-c1ef969da4c3} • 349,228 users
unknown 
# User Agent Switcher
{e968fc70-8f95-4ab9-9e79-304de2a71ee1} • 343,383 users
unknown 
Version Used
0.7.3.1-signed.1-signed No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
0.7.3.1-signed.1-signed 0.00 0
# Provider for Google Calendar
{a62ef8ec-5fdc-40c2-873c-223b8a6925cc} • 338,360 users
unknown 
# Xmarks Sync
foxmarks@kei.com • 337,623 users
unknown 
Version Used
4.4.1 Yes
Version Avg blocking CPOW calls per session hour Avg ms per blocking
4.4.1 0.00 0
# Google Translate, ImTranslator, Dictionary, TTS
{9AA46F4F-4DC7-4c06-97AF-5035170634FE} • 336,652 users
incompatible 
# Download Statusbar
{D4DD63FA-01E4-46a7-B6B1-EDAB7D6AD389} • 331,909 users
unknown  Yes
# Easy Youtube Video Downloader Express
{b9acf540-acba-11e1-8ccb-001fd0e08bd4} • 326,119 users
compatible-webextension 
Version Used
9.15 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
9.15 0.00 0
# New Tab by Yahoo
jid1-G80Ec8LLEbK5fQ@jetpack • 318,370 users
unknown 
# AdBlocker for YouTube™
jid1-q4sG8pYhq8KGHs@jetpack • 314,420 users
compatible-webextension 
Version Used
0.2.5 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
0.2.5 0.00 0
# Personas Plus
personas@christopher.beard • 312,913 users
compatible 
Version Used
1.8.3 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
1.8.3 0.00 0
# ProxTube - Unblock YouTube
ich@maltegoetz.de • 311,056 users
compatible 
Version Used
2.3.9 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
2.3.9 0.00 0
# Easy Access
quicklaunch@mozillaonline.com • 303,194 users
incompatible 
# YouTube Flash Video Player
{f3bd3dd2-2888-44c5-91a2-2caeb33fb898} • 299,809 users
compatible 
Version Used
54.0 No
53.0 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
54.0 0.00 0
53.0 0.00 0
# Session Manager
{1280606b-2510-4fe0-97ef-9b5a22eafe30} • 288,482 users
compatible 
Version Used
0.8.1.13 No
0.8.1.13pre20170130b No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
0.8.1.13 0.00 0
0.8.1.13pre20170130b 0.00 0
# FoxyProxy Standard
foxyproxy@eric.h.jung • 286,381 users
compatible 
Version Used
4.6.5 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
4.6.5 0.00 0
# ZenMate Security & Privacy VPN
firefox@zenmate.com • 285,639 users
unknown 
# YouTube High Definition
{7b1bf0b6-a1b9-42b0-b75d-252036438bdc} • 284,115 users
compatible 
Version Used
52.0.3 No
52.0.1 No
52.0 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
52.0.3 0.00 0
52.0.1 0.00 0
52.0 0.00 0
# Disconnect
2.0@disconnect.me • 283,780 users
compatible-webextension 
Version Used
5.18.21 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
5.18.21 0.00 0
# Mozilla Firefox hotfix
firefox-hotfix@mozilla.org • 283,311 users
compatible 
# Amazon Assistant for Firefox
abb@amazon.com • 280,014 users
compatible-webextension 
Version Used
10.1706.14.745 No
10.1705.31.904 Yes
Version Avg blocking CPOW calls per session hour Avg ms per blocking
10.1706.14.745 0.00 0
10.1705.31.904 0.00 0
# Full Web Page Screenshots (♥♥♥♥♥)
{0b457cAA-602d-484a-8fe7-c1d894a011ba} • 279,529 users
compatible 
# NetVideoHunter
netvideohunter@netvideohunter.com • 278,207 users
unknown 
# VKontakte.ru Downloader (music/videos/photos @ VK)
vk@sergeykolosov.mp • 275,379 users
unknown 
# QuickJava
{E6C1199F-E687-42da-8C24-E7770CC3AE66} • 274,114 users
compatible 
Version Used
2.1.2 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
2.1.2 0.00 0
Yes
# ColorZilla
{6AC85730-7D0F-4de0-B3FA-21142DD85326} • 273,013 users
compatible-webextension 
Version Used
3.3 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
3.3 0.00 0
# Video Downloader professional
ffext_basicvideoext@startpage24 • 258,678 users
unknown 
# frigate
e67f8350-7edf-11e3-baa7-0800200c9a66@fri-gate.org • 258,320 users
unknown 
Version Used
2.2.1.1-signed Yes
Version Avg blocking CPOW calls per session hour Avg ms per blocking
2.2.1.1-signed 0.00 0
# ColorfulTabs
{0545b830-f0aa-4d7e-8820-50a4629a56fe} • 250,595 users
compatible 
Version Used
31.1.7 No
Version Avg blocking CPOW calls per session hour Avg ms per blocking
31.1.7 0.00 0

# Footnotes

  1. This is checking multi-process compat. flag in the add-on as listed on AMO. Error means its not listed on AMO.
  2. This is shim data returned to telemetry (see the python notebook).
  3. This is CPOW data returned to telemetry (see the python notebook).
  4. This is a manual list of bugs assigned to this addon in Bugzilla. Maintained in data.json.
  5. Is this add-on featured, by checking the API