Crossword Genius

They protect popular web browsers without using force (8)

Ross

I believe the answer is:

insurers

I'm a little stuck... Click here to teach me more about this clue!

'popular web browsers without using force' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'they protect' is the wordplay.
I cannot quite understand how this works, but
'protect' could be 'insure' (insuring is a kind of protecting) and 'insure' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Times.
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