Line Chart on Firefox can't select the points

[macvag]

I'm submitting a ... (check one with "x")

[x ] bug report => search github for a similar issue or PR before submitting
[ ] feature request
[ ] support request => Please do not submit support request here

Current behavior

Reproduction of the problem
To reproduce the bug you can from Firefox:

1. go to https://swimlane.gitbooks.io/ngx-charts/content/charts/line-chart.html
2. add more points to data.ts
3. try to select a point

• Browser: [ Firefox 55.0.2 (64-bit) ]

[RafikSM]

I have the same problem here on firefox

[tobigit]

I have already created an issue about that: #469

[marjan-georgiev]

Closing as this is a duplicate of #469