Tabshift opens a web address you choose on every new tab. It collects nothing.

• No data leaves Firefox. Tabshift has no server, no account, no analytics and no error reporting. It makes no network requests of its own.
• What it stores, and where. The pages you save (a name and an address) and your settings are stored in Firefox's sync storage, so they follow you to other computers if you use Firefox Sync; otherwise they stay on this computer. A copy of your current choice is kept in the extension's local storage so new tabs open instantly. A few counters (how many times you changed your new tab, on which days) stay on this computer and decide when to ask, once, for a review.
• What it can see. Tabshift has no access to the sites you visit. When you click "Use this page", it reads the address and title of that one tab, at that moment, because you asked.
• What it asks for. Tabshift asks for the storage, menus and activeTab permissions only. It can't open files from your computer.
• Removing your data. Remove pages in Settings, or uninstall Tabshift; uninstalling deletes everything it stored.