Can I use two Gmail accounts at once?

Outline Tab does not split cookies. Use Firefox Multi-Account Containers for a separate cookie jar per login, then assign each container's tabs an Outline key.

Does Outline Tab work in Chrome?

No. Firefox only. Chrome cannot proxy a single tab. LibreWolf and Zen can load the same add-on.

Is this the official Outline client?

No. It is an independent add-on. You bring your own Outline access keys. It is not affiliated with Outline Foundation or Jigsaw.

Why do I have to load it again after Firefox quits?

Firefox only keeps unsigned add-ons for the session. Load the same manifest.json from about:debugging after each restart.

How do I disable WebRTC in Firefox?

Open about:config, accept the warning, search media.peerconnection.enabled, and set it to false. That turns WebRTC off for the whole browser. Google Meet and similar will stop working. To hide host IPs without killing calls, leave that true and set media.peerconnection.ice.no_host to true. Check at browserleaks.com/webrtc.

Firefox only · v1.1.1

Point any tab at any Outline key.

Name the keys. Put each tab on the one it should use. Several tabs, several keys, at the same time.

Firefox tab strip: a US West group on news.ycombinator.com and github.com, an EU group on ip-api.com, and Gmail left direct. — US West and EU are named Outline keys. Gmail is not on a key.

Download Outline Tab Install steps

Install

Download outline-tab.zip and unzip it.
In a terminal:
```
cd outline-tab-1.1.1
./install.sh
```
That installs a local helper. macOS includes a prebuilt binary. Linux needs Go 1.25+ to compile.
In Firefox open about:debugging#/runtime/this-firefox
Click Load Temporary Add-on…
Select extension/manifest.json in the unzipped folder
Paste an ss:// key, name it, arm a tab. Add another key and arm a different tab.

Firefox drops temporary add-ons when it quits. After a restart, load the same manifest.json again. The helper stays installed.

What it does

Each armed tab is assigned one Outline key. Unarmed tabs stay on your normal connection. Keys are named, so the tab strip shows which server a tab is using.

Firefox can pick a proxy per tab. Chrome cannot, which is why this is Firefox only. Outline speaks Shadowsocks, so a local helper turns each key into SOCKS5 on localhost.

Cookies are a different layer. How to isolate logins with Firefox containers, and how to run your own Outline server.

FAQ

Chrome, Brave, Edge?

No. Firefox only. Those browsers cannot proxy a single tab. LibreWolf and Zen can load the same add-on.

Two Gmail accounts at once?

Outline Tab does not split cookies. Use Multi-Account Containers so each login lives in its own container, then arm that tab in Outline Tab with the matching key. Full walkthrough in the guide.

Official Outline app?

No. Independent. You bring your own access keys. Not affiliated with Outline Foundation or Jigsaw.

Does the developer see my traffic?

No. Keys stay on your machine. Each armed tab goes to the Outline server in that tab’s key. See the privacy policy.

WebRTC?

A page can still learn your real IP through WebRTC. This is browser-wide, not per tab.

Open about:config
Accept the warning
Search media.peerconnection.enabled
Set it to false

Google Meet, Discord-in-the-browser, and similar will stop until you flip it back. If you still want calls, leave that true and set media.peerconnection.ice.no_host to true instead. Check at browserleaks.com/webrtc.