1475086 - When starting Firefox 61 with the homepage set to "blank page", it doesn't show the about:blank page (white background with Firefox icon) but the page seen before any page starts loading (grey background with no icon)

Status: RESOLVED DUPLICATE of bug 1422507

(Firefox :: Tabbed Browser, defect)

Description

[Reem]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0
Build ID: 20180704003137

Steps to reproduce:

In Firefox 61.0.1
Set "Options > Home > Homepage and new windows" to "Blank Page"
Set "Options > Home > New tabs" to "Blank Page"
Close Firefox ans start it again



Actual results:

When starting Firefox, it shows a grey page without favicon (the temporary page with the menu background color, that is shown before Firefox displays any new page).

When opening a new tab it shows a white page with the Firefox favicon (the about:blank regular page)


Expected results:

When starting Firefox it also should show the about:blank page.

It's important not only for consistency, but  because the about:blank page let you run extensions in it, like mouse gestures, while the temporary page shown on startup does not.

Comment 1

[Ciprian Muresan [:cmuresan], Ecosystem QA]

I have manged to reproduce this issue on the latest Firefox Release (61.0.1) and on the latest Nightly build (63.0a1, 20180801223951) on Windows 10, Mac 10.13.6 and Arch Linux. For older builds, where you can't set the New Tab page to about:blank, I've used the https://addons.mozilla.org/en-US/firefox/addon/blank-new-tab/ addon.
The issue is reproducible on each new window after it is set to show a blank page.

26:45.54 INFO: Narrowed inbound regression window from [5d86f27f, 0533dbf2] (4 builds) to [7e5b2881, 0533dbf2] (2 builds) (~1 steps left)
26:45.54 INFO: No more inbound revisions, bisection finished.
26:45.54 INFO: Last good revision: 7e5b28819e5b382bea8cbcccf0c6402fe0e90192
26:45.55 INFO: First bad revision: 0533dbf2956818762fbbe7dbcfad738fe8383d89
26:45.55 INFO: Pushlog:
https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=7e5b28819e5b382bea8cbcccf0c6402fe0e90192&tochange=0533dbf2956818762fbbe7dbcfad738fe8383d89

It looks like bug 1379587 has caused this issue.

Florian, could you please take a look at this?

Comment 2

[Florian Quèze [:florian]]

(In reply to Reem from comment #0)

> It's important not only for consistency, but  because the about:blank page
> let you run extensions in it, like mouse gestures, while the temporary page
> shown on startup does not.

It's not a temporary page, the about:blank page is loaded but not painted (its opacity is set to 0).