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Default background color is now ... sand? (#eebe5f)

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Firefox 39.0.3 on Fedora 22 XFCE spin:

This is a new installation.

In a first iteration, I installed Firefox from the Fedora repository and used it from a completely new user account freshly created on that machine. Nothing of note happened.

In a second iteration, I mounted the "/home" directory from another disk, so that the user account from my earlier installation (Fedora 20) became live again. This means that Firefox 39.0.3 on first start would find settings for Firefox 38.0.5, the last one for Fedora 20.

Lo and behold, the color for (imagine) "no color", in particular for the empty page that is shown before content comes in over the Internet has become SAND, more precisely: #eebe5f, instead of the previous WHITE.

This gives interesting effects, in particular if you go to Amazon Web Services, you get a sandy bar at the top (see image).

It even affects Firefox itself. In "Preferences", the "Help Button" is now sand, too.

It's a bit weird, any idea where it could come from?

(Will create a new user account and firefox from there to check)

Firefox 39.0.3 on Fedora 22 XFCE spin: This is a new installation. In a first iteration, I installed Firefox from the Fedora repository and used it from a completely new user account freshly created on that machine. Nothing of note happened. In a second iteration, I mounted the "/home" directory from another disk, so that the user account from my earlier installation (Fedora 20) became live again. This means that Firefox 39.0.3 on first start would find settings for Firefox 38.0.5, the last one for Fedora 20. Lo and behold, the color for (imagine) "no color", in particular for the empty page that is shown before content comes in over the Internet has become SAND, more precisely: #eebe5f, instead of the previous WHITE. This gives interesting effects, in particular if you go to Amazon Web Services, you get a sandy bar at the top (see image). It even affects Firefox itself. In "Preferences", the "Help Button" is now sand, too. It's a bit weird, any idea where it could come from? (Will create a new user account and firefox from there to check)
Attached screenshots

Chosen solution

On Windows, the ? button color on Options / Preferences comes from chrome://global/skin/in-content/common.css:

background-color: #ffcb00;

Could you check here:

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful.

(2) In the search box above the list, type or paste color and pause while the list is filtered

(3) The browser.display.background_color preference usually is set to #FFFFFF (white) but yours might be set to this unusual color.

(4) The browser.display.use_system_colors preference will override the one in #3 if set to true, in which case, it would be the color Firefox is extracting from the system theme.

Do either of those seem relevant?

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Update: The sandy phenomenon does not occur if Firefox is started from a pristine new user account.

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Chosen Solution

On Windows, the ? button color on Options / Preferences comes from chrome://global/skin/in-content/common.css:

background-color: #ffcb00;

Could you check here:

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful.

(2) In the search box above the list, type or paste color and pause while the list is filtered

(3) The browser.display.background_color preference usually is set to #FFFFFF (white) but yours might be set to this unusual color.

(4) The browser.display.use_system_colors preference will override the one in #3 if set to true, in which case, it would be the color Firefox is extracting from the system theme.

Do either of those seem relevant?

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Hello,

The browser.display.background_color is indeed ffcc66, which is yellow/sand-ish for some reason. Where did Firefox pick that up?

Browser.display.use_system_colors is still false.

Setting to white does not change the button's color in "preferences" immediately... restarting Firefox.

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Well, the sandy yellow enhancements during load time and in parts of the website haveing no color have gone away now. The must have been #ffcc66, indeed I measure the color from the "?" button in preferences assuming it would be the same color.

But the "?" button in preferences is still yellow. Maybe it is meant to be that way :-)

Anyway looks like Firefox reads settings from an earlier installation somewhat incorrectly.