Intention:
Insert media file in article using Firefox

Steps to Reproduce:
0. Open up Firefox

1. Go to https://sv.wikipedia.org/wiki/Foo?veaction=edit&uselang=en
2. Click Insert -> Media
3. Write "Foo" in search window
4. Select image
5. Click Insert -> Media again

Actual Results:
After 3: Image search returns 5*3 images
After 5: Image search returns more images accessible using the vertical scrollbar

Expected Results:
After 3: Image search returns more images accessible using the vertical scrollbar

Reproducible: Didn't try

This problem becomes more severe since beginners don't realise that there are ever more than 15 possible images, meaning they can usually not find an image they previously identified on Commons.

Works fine in Chrome though.

Version: unspecified
Severity: normal