Hi, I was able to reproduce this bug only on Nightly 69.0a1. I cannot reproduce it in Firefox Release 67.0 and Firefox Beta 68.0b4. Steps to reproduce: 1. Install Tree Style Tab addon that uses the sidebar. 2. Look at some page that uses a fixed positioned overlay element that floats over text and images. The Firefox homepage is an example. Scroll down the page Actual results: Page text and images that clearly are meant to be below some overlay element on top of them actually draw on top of it instead! This even affects the Firefox homepage (see attached). Expected results: The text and images should be drawn below fixed positioned overlay elements with higher z-indexes. I also performed a mozregression in order to get a Regression range and here are the results. First bad build https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=2ccc6648064315964dd23039ad28ebf7d9f82999&tochange=7e40e33da3da2640e965a153254594a234231f76 Last known Good build https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=45e3c6135d0759e37a270e4ff0d8cf1d0ec03f21&tochange=7e40e33da3da2640e965a153254594a234231f76
Bug 1553007 Comment 3 Edit History
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Hi, I was able to reproduce this bug only on Nightly 69.0a1. I cannot reproduce it in Firefox Release 67.0 and Firefox Beta 68.0b4. Steps to reproduce: 1. Install Tree Style Tab addon that uses the sidebar. 2. Look at some page that uses a fixed positioned overlay element that floats over text and images. The Firefox homepage is an example. Scroll down the page Actual results: Page text and images that clearly are meant to be below some overlay element on top of them actually draw on top of it instead! This even affects the Firefox homepage (see attached). Expected results: The text and images should be drawn below fixed positioned overlay elements with higher z-indexes. I also performed a mozregression in order to get a Regression range and here are the results. First bad build https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=2ccc6648064315964dd23039ad28ebf7d9f82999&tochange=7e40e33da3da2640e965a153254594a234231f76 Last known Good build https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=45e3c6135d0759e37a270e4ff0d8cf1d0ec03f21&tochange=7e40e33da3da2640e965a153254594a234231f76 Thanks for your report.