Faster sorting, settings that cannot get lost, and cookieless icons

Sorting a big window used to move tabs one at a time, and you could watch the strip churn its way
through them. Tabs going to neighbouring positions now move together, so a few hundred tabs is a
handful of operations instead of a few hundred.

Settings were written on every keystroke, and the browser's sync storage allows 120 writes a
minute — typing a filter at any normal speed went over the limit, and the setting was silently
lost. Writes now wait for you to stop typing, and if one still fails the popup says so instead of
quietly dropping it.

Three fixes to things acting on their own. Two tabs opening in the same instant could leave one of
them unrecognised as new, so Auto-Group skipped it and the duplicate check never ran on it. A URL
written with an explicit port — https://example.com:80/ — was treated as the same address as the
one without, so one of the two tabs could be closed as a duplicate when it was not. And
Auto-Group no longer touches a tab in a popup window opened by a web app.

The favicons in the Duplicates and Reload lists are now requested without cookies, so a site you
are signed in to can no longer tell that your account opened the popup. Sites that do not allow
anonymous requests show a coloured initial instead of their icon.

Also: a filter or sort pattern is no longer run against more than the first 2048 characters of a
page's title, so a page cannot stall the extension with a very long one.

Auto-group

Build a list of rules — domain, hostname, URL, host + path or title, matched by contains / is exactly / starts with / regex — each pointing at a named, coloured tab group. Rules are checked top to bottom and the first match decides a tab's group; a tab that matches nothing is left alone.

Turn on "Automatically group new tabs as they open" to have it happen live, or leave it off and press "Group tabs now" when you want it. Either way it only ever adds a tab to the group its rule points at — it never pulls a tab out of a group you put it in by hand.

Also in this release

• "Group tabs (saved rules)" is on the toolbar menu and on a tab's right-click menu. It ships without a keyboard shortcut; assign one from about:addons, gear icon, Manage Extension Shortcuts.
• The popup's tab bar was refitted for the sixth panel so no label is cramped.