Bugzilla

**Affected versions**
* Nightly 89.0a1

**Affected platforms**
* Windows 10

**Steps to reproduce**
1. Make sure to have dark theme enabled in Windows 10
2. Start Firefox
3. Go to about:preferences#search
4. Click the Default Search Engine dropdown

**Expected result**
* Items in the dropdown are visible and respect the dark theme set in the OS.

**Actual result**
* Dropdown is white and the items are also in white text, making them invisible. They are visible only when hovering over them or going through them using arrow keys.

**Regression range**
* First bad: 72593dfc1e16b16ef11770d9e01a970d0e116d6f
* Last good: a5a265c2b2a5fa906275ffb8a1910c3e734bc76b
* Pushlog: https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=a5a265c2b2a5fa906275ffb8a1910c3e734bc76b&tochange=72593dfc1e16b16ef11770d9e01a970d0e116d6f
* Potential regressor: Bug 1701493 - [Proton] The drop-down background of the select box in the extension inline options page is transparent.

**Additional notes**
* Screenshot showing the issue is attached.

**Suggested severity**
* I would say this is S2 severity because none of the items inside dropdowns can be seen and this is a recent regression.

**Affected versions**
* Nightly 89.0a1

**Affected platforms**
* Windows 10

**Steps to reproduce**
1. Make sure to have dark theme enabled in Windows 10
2. Start Firefox
3. Go to about:preferences#search
4. Click the Default Search Engine dropdown

**Expected result**
* Items in the dropdown are visible and respect the dark theme set in the OS.

**Actual result**
* Dropdown is white and the items are also in white text, making them invisible. They are visible only when hovering over them or going through them using arrow keys.

**Regression range**
* First bad: 72593dfc1e16b16ef11770d9e01a970d0e116d6f
* Last good: a5a265c2b2a5fa906275ffb8a1910c3e734bc76b
* Pushlog: https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=a5a265c2b2a5fa906275ffb8a1910c3e734bc76b&tochange=72593dfc1e16b16ef11770d9e01a970d0e116d6f
* Potential regressor: Bug 1701493 - [Proton] The drop-down background of the select box in the extension inline options page is transparent.

**Additional notes**
* Screenshot showing the issue is attached.
* Having Light theme set in OS does not show this issue.

**Suggested severity**
* I would say this is S2 severity because none of the items inside dropdowns can be seen and this is a recent regression.