fix safari:forward/back not work on ELECOM mouse assistant

ELECOMMOUSE.xml

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<data>
    <vid>1390</vid>
    <pid>249</pid>
    <select_profile>0</select_profile>
    <profile>
        <profname>default</profname>
        <lbutton>1</lbutton>
        <rbutton>2</rbutton>
        <tbutton>5</tbutton>
        <button4>41</button4>
        <button5>41</button5>
        <tiltleft>39</tiltleft>
        <tiltright>40</tiltright>
        <scrolls>5</scrolls>
        <hlotate>5</hlotate>
        <hspeed>5</hspeed>
        <hcount>0</hcount>
        <button6>48</button6>
        <button7>48</button7>
        <button8>48</button8>
        <lbutton_etcKey_key1>0</lbutton_etcKey_key1>
        <lbutton_etcKey_key2>0</lbutton_etcKey_key2>
        <rbutton_etcKey_key1>0</rbutton_etcKey_key1>
        <rbutton_etcKey_key2>0</rbutton_etcKey_key2>
        <tbutton_etcKey_key1>0</tbutton_etcKey_key1>
        <tbutton_etcKey_key2>0</tbutton_etcKey_key2>
        <button4_etcKey_key1>1</button4_etcKey_key1>
        <button4_etcKey_key2>66</button4_etcKey_key2>
        <button5_etcKey_key1>1</button5_etcKey_key1>
        <button5_etcKey_key2>65</button5_etcKey_key2>
        <tiltleft_etcKey_key1>0</tiltleft_etcKey_key1>
        <tiltleft_etcKey_key2>0</tiltleft_etcKey_key2>
        <tiltright_etcKey_key1>0</tiltright_etcKey_key1>
        <tiltright_etcKey_key2>0</tiltright_etcKey_key2>
        <button6_etcKey_key1>0</button6_etcKey_key1>
        <button6_etcKey_key2>0</button6_etcKey_key2>
        <button7_etcKey_key1>0</button7_etcKey_key1>
        <button7_etcKey_key2>0</button7_etcKey_key2>
        <button8_etcKey_key1>0</button8_etcKey_key1>
        <button8_etcKey_key2>0</button8_etcKey_key2>
        <dispGesture>1</dispGesture>
    </profile>
</data>