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fix(extension): preserve composer focus and pending page reads #884

Job	Run time
docs changes	31s
docs benchmark (${{ matrix.target }})	0s
docs build	1m 21s
docs source	1m 46s
docs acceptance (http)	2m 12s
docs acceptance (chromium)	2m 7s
docs acceptance (corpus)	2m 24s
docs acceptance (webkit)	2m 55s
docs HTTP	3s
	13m 19s