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Preview of Slack App-in-Tab Reborn

Slack App-in-Tab Reborn by Axel Leroy

Open the Slack app with its multi-workspace sidebar in a simple browser tab, freeing you from using the Slack app!

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You'll need Firefox to use this extension
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Screenshots
A workspace switcher is shown in the Slack UI as the user clicked on the current workspace's icon
About this extension
Slack App-in-Tab Reborn is a fork of "Slack App-in-Tab" which has unfortunately stopped working. This version keeps the same functionality as the original.

How to use
  1. Install the extension
  2. Visit https://app.slack.com and log into any of your workspaces
  3. That's it, all your workspaces appear in the sidebar, just like in the Slack App

How does it work?

Slack App-in-Tab Reborn changes how Firefox presents itself to Slack so it believes you are browsing from a Chromebook. Since Chromebooks can't run the Slack app, it then shows the workspace switcher as it does in the app.
Developer comments
Access to slack.com is required in order to change the User-Agent (the way Firefox presents itself to Slack)
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Permissions and dataLearn more

Required permissions:

  • Access browser tabs
  • Access your data for sites in the slack.com domain
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Add-on Links
Version
2025.6.20
Size
24.22 KB
Last updated
2 months ago (Jun 20, 2025)
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Release notes for 2025.6.20
Updated User Agent string to XXX
More extensions by Axel Leroy