Little jump with generated content on :hover in Gecko

1. p:hover:after {content:"generated"}

   no jump

2. p:hover:after {content:"generated"}

   p {font-size-adjust:.53;}

   no jump

3. p:hover:after {content:"generated"}

   p {font-size-adjust:.53; font-size:1.3em;}

   no jump

4. p:hover:after {content:"generated"}

   p {font-size-adjust:.53; font-size:1.3em; font-weight:bold;}

   no jump

5. p:hover:after {content:"generated"}

   p {font-size-adjust:.53; font-size:1.3em; font-weight:bold}

   p:after {font-weight:normal;}

   jump

6. p:hover:after {content:"generated"}

   p {font-size-adjust:.5; font-size:1.3em; font-weight:bold;}

   p:after {font-weight:normal;}

   no jump

7. p:hover:after {content:"generated"}

   p {font-size-adjust:.53; font-size:1.25em; font-weight:bold}

   p:after {font-weight:normal;}

   no jump

8. p:hover:after {content:"generated"}

   p {font-size-adjust:.54; font-size:1.3em; font-weight:bold}

   p:after {font-weight:normal;}

   no jump

9. p:hover:after {content:"generated"}

   p {font-size-adjust:.54; font-size:1.15em; font-weight:bold}

   p:after {font-weight:normal;}

   jump

tested in FF/Win 2.0.0.1, 2.0.0.4 pre