[Bug Report] Caret is not visually centered in Firefox
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component: select
stale
- Dominant language
- Vue
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- 54k
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Description
### Element UI version
2.4.3
### OS/Browsers version
Firefox 61.0
### Vue version
2.5.16
### Reproduction Link
[https://jsfiddle.net/mmx38qxw/3327/](https://jsfiddle.net/mmx38qxw/3327/)
### Steps to reproduce
Arrow is located a little bit too high:

### What is Expected?
Arrow to be visually centered (like in Chrome).
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