Bugzilla

STR:
1. In a fresh Firefox profile, open two tabs, both viewing a site that has some tracker that triggers our tracker-count UI.
e.g. https://www.moody.edu/ gives me a tracker-count of `1` (with default ETP settings and no adblocker installed).
Or you can use e.g. `https://www.yahoo.com/` which gives me a tracker count of >100 (not always the same exact number; depends on exact ad load etc.)
2. If the long-form tracker count displays (`N trackers blocked`): either wait ~20 seconds or shrink your window horizontally, so that it collapses down to just a number.
3. Switch back and forth between the tabs with Ctrl+Tab.

ACTUAL RESULTS:
The tracker-count animates into existence on every tab-switch (even though I'm switching back and forth between two tabs that were both already showing it)

EXPECTED RESULTS:
The tracker count shouldn't disappear-and-then-animate-back when I'm switching between these tabs.  Probably it should just get swapped atomically with the rest of the URL bar contents (which in this case means you wouldn't see any change as you switch tabs).

I'm using Firefox Nightly 155.0a1 (2026-07-29) (64-bit) on Ubuntu 26.04

STR:
1. In a fresh Firefox profile, open two tabs, both viewing a site that has some tracker that triggers our tracker-count UI.
e.g. https://www.moody.edu/ gives me a tracker-count between `1` and `3` (with default ETP settings and no adblocker installed).
Or you can use e.g. `https://www.yahoo.com/` which gives me a tracker count of >100 (not always the same exact number; depends on exact ad load etc.)
2. If the long-form tracker count displays (`N trackers blocked`): either wait ~20 seconds or shrink your window horizontally, so that it collapses down to just a number.
3. Switch back and forth between the tabs with Ctrl+Tab.

ACTUAL RESULTS:
The tracker-count animates or flickers out-of and back-into existence on every tab-switch (even though I'm switching back and forth between two tabs that were both already showing it)

EXPECTED RESULTS:
The tracker count shouldn't disappear-and-then-reappear when I'm switching between these tabs.  Probably it should just get swapped atomically with the rest of the URL bar contents (which in this case means you wouldn't see any change as you switch tabs).

I'm using Firefox Nightly 155.0a1 (2026-07-29) (64-bit) on Ubuntu 26.04

STR:
1. In a fresh Firefox profile, open two tabs, both viewing a site that has some tracker that triggers our tracker-count UI.
e.g. https://www.moody.edu/ gives me a tracker-count between `1` and `3` (with default ETP settings and no adblocker installed).
Or you can use e.g. `https://www.yahoo.com/` which gives me a tracker count of >100 (not always the same exact number; depends on exact ad load etc.)
2. If the long-form tracker count displays (`N trackers blocked`): either wait ~20 seconds or shrink your window horizontally, so that it collapses down to just a number.
3. Switch back and forth between the tabs with Ctrl+Tab.

ACTUAL RESULTS:
The tracker-count animates or flickers out-of and back-into existence on every tab-switch (even though I'm switching back and forth between two tabs that were both already showing it)

EXPECTED RESULTS:
The tracker count shouldn't disappear-and-then-reappear when I'm switching between these tabs.  Probably it should just get swapped atomically with the rest of the URL bar contents (which in this case means you wouldn't see any change as you switch tabs, other than maybe the number if one tab had `2` trackers blocked and the other had `3`)

I'm using Firefox Nightly 155.0a1 (2026-07-29) (64-bit) on Ubuntu 26.04