AnyTitle от Eloi Barti

AnyTitle lets you give any open tab a custom title. Right-click the tab, choose Rename Tab, and type the title you want — it sticks even if the page tries to change it back, and persists as you navigate within that tab.

To reset, open Rename Tab again and submit an empty field; the tab reloads and its original page title returns. Closing the tab also clears the custom title.

Custom titles live only in memory while the tab is open. AnyTitle stores nothing, syncs nothing, and makes no network requests.