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fix(extension): preserve composer focus and pending page reads #883

Job	Run time
docs changes	27s
docs benchmark (${{ matrix.target }})	0s
docs source	1m 44s
docs build	1m 43s
docs acceptance (http)	2m 2s
docs acceptance (chromium)	2m 5s
docs acceptance (corpus)	2m 37s
docs acceptance (webkit)	2m 44s
docs HTTP	2s
	13m 24s