Firefox allows you to open multiple tabs automatically on browser start. To do this, Firefox expects a single string of URLs separated by the pipe character | in the Homepage settings.

Each URL between two pipes is opened as a separate tab when Firefox starts.

While the feature itself is powerful, editing pipe-separated URLs in a single-line input field is error-prone and frustrating.

TabsOnFire 🔥🗂️ turns that hidden configuration string into a clear, editable list so you can manage your startup tabs comfortably.

TabsOnFire works both ways: you can create a new Firefox startup snippet from scratch, or edit an existing one.

Create a New Snippet

1. Enter the URLs of the pages you want to open at startup, one by one.
2. Reorder, edit, or remove any URL as needed.
3. Copy the generated pipe-separated snippet.
4. Paste it into Firefox → Settings → Home → "Homepage and new windows".

Edit an Existing Snippet

1. Paste your current Firefox pipe-separated snippet into TabsOnFire 🔥🗂️.
2. The tool splits it into individual URLs for easy editing.
3. Reorder, edit, or remove URLs as needed.
4. Copy the updated snippet and paste it back into Firefox settings.

TabsOnFire 🔥🗂️ keeps everything local – nothing is stored or sent anywhere – so you can safely edit your startup tabs without worrying about privacy.

Paste your existing pipe-separated homepage string into TabsOnFire 🔥🗂️. The tool will split it into individual URLs so you can edit and reorganize them easily.

Can Firefox open multiple tabs on startup?

Yes. Firefox supports multiple startup tabs using pipe-separated URLs in the Homepage setting.

Does TabsOnFire 🔥🗂️ store my URLs?

No. Everything runs locally in your browser. No data is sent or stored anywhere.