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fix(extension): preserve composer focus and pending page reads #882

Job	Run time
docs changes	29s
docs benchmark (${{ matrix.target }})	-1s
docs build	1m 27s
docs source	1m 51s
docs acceptance (http)	2m 8s
docs acceptance (chromium)	2m 1s
docs acceptance (webkit)	2m 45s
docs acceptance (corpus)	2m 34s
docs HTTP	4s
	13m 18s