Licensing
Free Trial
When you first install TabCmdr, you get a free trial period with full access to all features. The trial starts from the moment you install the extension.
After the Trial
Once the trial ends, TabCmdr enters a grace period. During the grace period you still get a limited number of free uses per day. The counter resets every 24 hours.
If you’ve used up your daily grace uses, TabCmdr will prompt you to activate a license.
Purchasing a License
Buy a license key from the TabCmdr page on Gumroad. You’ll receive a license key by email after purchase.
Activating a License
- Open the TabCmdr Settings page.
- Find the License section.
- Paste your license key into the input field.
- Click Activate.
TabCmdr sends your license key to Gumroad’s API to verify it. If valid, the extension unlocks immediately and stays unlocked.
Re-validation
TabCmdr periodically re-validates your license in the background (roughly every 12–16 days, randomized). This is the only automatic network request the extension makes.
If re-validation fails (e.g., you’re offline), TabCmdr continues working with the last known license state. It does not block you or retry aggressively.
Offline Use
TabCmdr works fully offline. The only thing that requires a network connection is license activation and periodic re-validation. All other features run entirely inside your browser.
Refunds & Cancellations
If a license is refunded or cancelled on Gumroad, the next re-validation will detect this and the extension will revert to grace-period mode.
What Is Stored
| Key | Location | Contents |
|---|---|---|
_lk | browser.storage.local | A signed token containing your license key, a timestamp, and a validity flag |
_trial | browser.storage.local | The timestamp when you first installed the extension |
_grace | browser.storage.local | How many free uses remain today |
None of this data is ever sent to TabCmdr servers (there are none). The only external service involved is Gumroad for license verification.