**[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?
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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: 11:02.43 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?