The footnotes point out variant readings in the Critical Text (Nestle-Aland and UBS) and the Majority Text (MT). If you view them as deviant, fine. But I find it useful to see where these differences are, as reflected in the NASB and ESV (for example) which don't give you the benefit of TR footnotes.

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Jim
1689 LBCF
Independent Bible Church
North Texas, USA