@@ -141,11 +141,10 @@
 
         # masks
         self._arcMask = (2 ** ((self.nBytesArc * 8) - 3)) - 1
         self._finalNodeMask = 1 << ((self.nBytesArc * 8) - 1)
         self._lastArcMask = 1 << ((self.nBytesArc * 8) - 2)
-        self._addrBitMask = 1 << ((self.nBytesArc * 8) - 3)  # version 2
 
         # function to decode the affix/suffix code
         if self.cStemming == "S":
             self.funcStemming = st.changeWordWithSuffixCode
         elif self.cStemming == "A":
@@ -200,11 +199,10 @@
         # <dChar> to get the value of an arc, <dCharVal> to get the char of an arc with its value
         self.dChar = {}
         for i in range(1, self.nChar+1):
             self.dChar[self.lArcVal[i]] = i
         self.dCharVal = { v: k  for k, v in self.dChar.items() }
-        self.nBytesOffset = 1 # version 3
 
     def _initJSON (self, oJSON):
         "initialize with a JSON text file"
         self.sByDic = ""  # init to prevent pylint whining
         self.__dict__.update(oJSON)
@@ -244,11 +242,10 @@
                 "nArcVal": self.nArcVal,
                 "lArcVal": self.lArcVal,
                 "nCompressionMethod": self.nCompressionMethod,
                 "nBytesArc": self.nBytesArc,
                 "nBytesNodeAddress": self.nBytesNodeAddress,
-                "nBytesOffset": self.nBytesOffset,
                 # JavaScript is a pile of shit, so Mozilla’s JS parser don’t like file bigger than 4 Mb!
                 # So, if necessary, we use an hexadecimal string, that we will convert later in Firefox’s extension.
                 # https://github.com/mozilla/addons-linter/issues/1361
                 "sByDic": self.byDic.hex()  if bBinaryDictAsHexString  else [ e  for e in self.byDic ],
                 "l2grams": list(self.a2grams)