Session Flow by PaxIgnis

Your Firefox windows and tabs, organized in one tree.

Session Flow is a free, open-source Firefox extension that brings your open tabs and saved sessions together in a dedicated window. Nest related pages, group windows under notes, and set work aside without keeping every tab open.

Features

• Arrange windows and tabs into collapsible branches with drag and drop.
• Save individual tabs or entire windows, closing them in Firefox while keeping their place in your tree.
• Add notes, meaningful window & tab names, and separators.
• Take snapshots manually or automatically. Preview and restore a complete session or selected items.
• Export snapshots as JSON and import supported exports from other session managers.
• Work with Firefox containers and tab groups.
• Customize keyboard shortcuts, tree actions, and startup behavior.

Getting started

Click the Session Flow toolbar button or press F2 to open your tree. An onboarding guide introduces the main features after installation.

Privacy

Your session tree, settings, snapshots, and favicon cache are stored locally in your Firefox profile. Session Flow has no analytics or tracking and does not send your browsing data to its developer.

Website icons may be retrieved from websites and their icon hosts. Fetching missing icons and refreshing cached icons require optional website access.

Permissions:

• Tabs and sessions
  • Required to: Track, organize, and restore browser windows and tabs.
• Containers and cookies
  • Required to: Read and manage Firefox container identities for tabs.
• Tab groups
  • Required to: Read and manage Firefox tab-group membership and metadata.
• Menus
  • Required to: Provide context-menu actions for tree items.
• Storage and unlimited storage
  • Required to: Keep your saved tree, settings, and favicon cache locally.
• Alarms
  • Required to: Schedule automatic snapshots and maintenance.
• Website access (optional)
  • Required to: Fetch missing favicons or refresh cached icons.
• Clipboard access (optional)
  • Required to: Copy snapshot JSON to the clipboard when you request it.

Compatibility

Requires Firefox 140 or later on desktop.

Disable other extensions that automatically manage, restore, move, close, or unload tabs and windows, as overlapping behavior can cause unexpected issues.

Support

For questions, bug reports, and suggestions, visit:
https://github.com/PaxIgnis/SessionFlow/discussions