Crossword puzzle clue "obstacle or any one of four black squares in this puzzle"

Obstacle ... or any one of four black squares in this puzzle?

Angle irons graphically represented by four sets of black squares in this grid, and by letter formations starting in the four longest answers

Popular browser extension ... or a literal description of four black squares in this puzzle

Word aptly represented by four black squares in this puzzle

Emulate Moses ... and what four black squares do in this puzzle

Common campaign promise, and what four black squares in this puzzle create

Psalm 100 excerpt suggested by six puzzle answers and graphically represented by certain black squares in this puzzle

Used a black marker on ... or a hint to three chunks of black squares in this puzzle