Waterfox G6.6.2

What's new in this version:

Fixes:
Theme:
- Refinements to the default Waterfox UI will continue as we iron out some kinks from the last release
- Tab shape has been restored to more closely resemble a physical tab
- Contrast between active/inactive tabs and the navigation bar is now clearer, making them easier to differentiate
- The active tab no longer has a blue context line at the top of the tab. You can restore it in Settings → Look & Feel → Interface Components → Tab Bar → Tab Context Line.
- Windows 11 users with supported hardware will now notice subtle translucency matching Windows Mica. If you prefer stronger translucency, you can use Windows Acrylic by setting widget.windows.mica.toplevel-backdrop to 2 in about:config.
- windows-11-light-mica
- Windows 11 Light Mica
- windows-11-light-acrylic
- Windows 11 Light Acrylic
- windows-11-dark-mica
- Windows 11 Dark Mica
- windows-11-dark-acrylic
- Windows 11 Dark Acrylic

Tab Groups:
What’s improved:
New tabs stay in the right group:
- New tabs now reliably open in the same tab group as the “source” tab
- Placement options (after / first / last) are applied within the group, so tabs won’t “jump” out of the group at the edges

Collapsing the only group works as you expect:
- If you collapse the only group in a window, the browser opens a single ungrouped tab and keeps it ungrouped so the group stays collapsed
- This works even if the new tab briefly inherits the group during creation

“Cancel auto‑grouping” shortcut is dependable:
- The 1‑second cancel window works consistently
- Shortcut defaults: Alt+ on macOS, Ctrl+ on other platforms
- It no longer duplicates listeners across windows
- Backtick/backquote detection is robust across layouts (the Backquote key is recognized reliably)
- Exact modifier matching (Ctrl vs Cmd vs Alt vs Shift) prevents accidental activations

More resilient and cleaner behavior:
- Grouping is skipped for tabs that land in a different window or have no source group
- We clean up timers and listeners when tabs are removed or windows close
- Listeners are registered across all current and future browser windows

What didn’t change:
- Your existing tab groups and settings are preserved
- Pinned tabs are never moved into groups
- Cross‑window grouping is not attempted (only tabs in the same window are grouped)

Reminder: Preferences you can use:
- Enable/disable auto grouping: browser.tabs.autoGroupNewTabs
- Placement: browser.tabs.autoGroupNewTabs.placement (after | first | last)
- Delay (1‑second cancel window): browser.tabs.autoGroupNewTabs.delayEnabled
- Delay duration (ms): browser.tabs.autoGroupNewTabs.delayMs
- Shortcut string: browser.tabs.autoGroupNewTabs.cancelShortcut

Misc:
- Recent history and top sites are available again in the address bar; they were disabled by accident in the previous release.
- Linux: Middle‑click paste in the address bar works again. A single click no longer interferes with what you’ve selected elsewhere, so middle‑click pastes the text you expect. Double‑click still selects the full address.
- This is the first release that attempts to address a long‑standing issue where, after updating, some users see an empty profile or their old profile appears hidden