The Massoretic text is the standard text for modern Jewish worship. It was fixed in its canon at the Council of Jamnia after the split with the early Christians, and the destruction of the Temple in Jerusalem. The Massoretes (scribes in Babylon), arranged the text as it stands today - including the vowel markings, and chant markings found in modern Hebrew Old Testaments. The Massoretic text differed from the LXX not only in the wording of many verses, but also in the ordering/numbering of the Psalms (and missing some chapters.)
St. Jerome had compared to the Hebrew, but from what we can tell his Hebrew texts were not the same as the Massoretic. Rather, they were likely Old Hebrew, like many of the 'Dead Sea Scrolls' which agree with the LXX.
The Geneva Bible, of course, is the Puritan bible and so has that corruption. It was never really used outside of extreme-Calvinist groups (in America, pretty much only amongst the Congregationalists, IIRC.) The King James Version, rather, became the American majority text from early on (it was published only 4 years after the founding of Jamestown.)