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By default, web browsers do not have a find/replace function (which is definitely odd, because they should). Some browsers do have add-on extensions that will add that feature on for you.
It looks like you're using Firefox, which does NOT seem to have a currently supported Find/Replace add-on... at least not that I found in my basic searches.
If you have access to Google Chrome, this extension looks decent and seems to be actively supported by the developer:
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