There is no "cancel" capability for quick filter. Let's continue at https://support.mozilla.org/en-US/questions/1461435

Hello and thanks for the advice to add an order received - https://bugzilla.mozilla.org/show_bug.cgi?id=1908761#c5.

When I sorted by that, the search function in my inbox recovered. It seems that 'order received' must be added to every inbox and allmail box. Otherwise, TB stops responding for 10 minutes (not seconds), the cursor disappears, and I cannot even see unfinished messages. (I have about 145,000 messages.) "Order received" is meaningless to most users. Should I keep it and sort from now on rather than date? It would greatly help if you fix this bug, that is apparently in the esr version.

And if a means to stop search were added, that would greatly help with future bugs. thank you again very much.

> It would greatly help if you fix this bug, that is apparently in the esr version.

Certainly, if 128.2.0 works for you when becomes available in a few days.

> And if a means to stop search were added, that would greatly help with future bugs. thank you again very much.

If the UI is truly 100% frozen then clearly there is no way to stop the search. If it is not 100% frozen then perhaps <escape> key or clicking on the "quick filter" button might randomly help.

Hello and thanks again. In the many times over the last few days that I faced frozen searches, multiple presses of the esc button did not work. Initially I thought that the search froze because TB went to the server, which holds about 145,000 of my messages rather than look at local files. But you all must understand something different. Without the 'order received' sorting, the search freezes at the first letter.