fixed this as TabRatio 0.7.1.
TabRatio now checks whether tabs.discard() actually exists at runtime.
Sleep automatically disappears when the browser doesn't support genuine tab discarding.
Tree Auto-Sleep also won't attempt unsupported discard calls.

he most important fixes were:

Firefox Android self-tab bug fixed. Firefox Android can present an extension popup as a normal tab, so TabRatio could count its own UI as one of your tabs. Internal/non-web pages are now excluded from tab counts, stale cleanup, duplicates, and saved workspaces.
Android popup cleanup improved. Switching to a real tab now closes the temporary TabRatio UI tab when appropriate.
Duplicate detection made safer. page#section1 and page#section2 are no longer incorrectly treated as the same duplicate.
Duplicate cleanup count fixed. If pinned/current tabs are protected, the button now reports only the tabs it can actually remove.
Workspace restore made fault-tolerant. One invalid or failed URL no longer stops the rest of the workspace from opening.
Non-web/invalid saved URLs are handled safely.
Unique workspace numbering improved so deleting an older workspace doesn't create duplicate names later.
Live tab refresh added. Dashboard and mobile UI respond to tab creation, removal, activation, title/favicon changes, etc.
Mobile Welcome CSS bug fixed. There was a literal escaped \n before a responsive breakpoint.
Settings and Goodbye pages received a cleaner responsive redesign.
Visual tab cards now have the favicon plus a small category marker.
Favicon requests use no-referrer.
Storage values are normalized so malformed/old settings don't destabilize the UI.
Better error messages were added throughout parking, restoring, saving, opening settings, and uninstall operations.
No windows API was reintroduced.
No <all_urls> permission was added.
No analytics, trackers, remote executable code, or additional permissions were added.

The Firefox minimums remain 140 desktop / 142 Android, which is still correct for Mozilla's built-in data_collection_permissions support.