Bug 1589038 Comment 0 Edit History

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**[Affected versions]:**
- Firefox Nightly 71.0a1, Build ID:  20191015213743
- Firefox Release Candidate 70, Build ID:20191014163058

**[Affected Platforms]:**
- All Windows
- All Mac
- All Linux

**[Steps to reproduce]:**
1. Open the Firefox Browser and navigate to the “about:welcome” page.
2. Horizontally resize the browser below 25%.
3. Observe the displayed scrollbars.

**[Expected result]:**
- The displayed scrollbars are active.

**[Actual result]:**
- The displayed scrollbars are inactive.

**[Regression Range]:**
- Due to the fact that this issue is not reproducible on Firefox Release 69, using the mozregression tool I’ve run a regression range and reached the following pushlog:
11:08.23 INFO: Last good revision: 5fff2a9bf0785afbdb774c178135cc9e9ad18211
11:08.23 INFO: First bad revision: 0bbd8e64cb9cbef70d12bcf502a8948882b63fe9
11:08.24 INFO: Pushlog:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=5fff2a9bf0785afbdb774c178135cc9e9ad18211&tochange=0bbd8e64cb9cbef70d12bcf502a8948882b63fe9

**[Notes]:**
- I’ve attached a screen recording with the issue.

@Emilio, could you please take a look at this?
**[Affected versions]:**
- Firefox Nightly 71.0a1, Build ID:  20191015213743
- Firefox Release Candidate 70, Build ID:20191014163058

**[Affected Platforms]:**
- All Windows
- All Mac
- All Linux

**[Steps to reproduce]:**
1. Open the Firefox Browser and navigate to the “about:welcome” page.
2. Horizontally resize the browser below 25%.
3. Observe the displayed scrollbars.

**[Expected result]:**
- The displayed scrollbars are active.

**[Actual result]:**
- The displayed scrollbars are inactive.

**[Regression Range]:**
- Due to the fact that this issue is not reproducible on Firefox Release 69, using the mozregression tool I’ve run a regression range and reached the following pushlog:
11:02.43 INFO: Last good revision: 0bbd8e64cb9cbef70d12bcf502a8948882b63fe9
11:02.43 INFO: First bad revision: 16d1399f602c8a336e8f6e7a160f0e698aff486d
11:02.43 INFO: Pushlog:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=0bbd8e64cb9cbef70d12bcf502a8948882b63fe9&tochange=16d1399f602c8a336e8f6e7a160f0e698aff486d

It seems like this issue was introduced with this [export](https://bugzilla.mozilla.org/show_bug.cgi?id=1567243) and possibly by this [bug 1563741](https://bugzilla.mozilla.org/show_bug.cgi?id=1563741).

**[Notes]:**
- I’ve attached a screen recording with the issue.

@Emilio, could you please take a look at this?

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