This seems to happen more often now, but interestingly it only seems to happen on Linux. The last run was in https://github.com/mozilla/pdf.js/pull/13021#issuecomment-786012076. @calixteman Could you take a look at this to see if we can make the tests pass again?

The relevant log output is:

```
Failures:
1) Interaction in js-colors.pdf must changes colors
  Message:
[31m    In firefox: Expected 'rgba(0, 54, 255, 0.13)' to equal 'rgb(255, 0, 0)'.[0m
  Stack:
    Error: In firefox: Expected 'rgba(0, 54, 255, 0.13)' to equal 'rgb(255, 0, 0)'.
        at <Jasmine>
        at Promise.all.pages.map (/home/ubuntu/pdfjs/botio-files-pdfjs/private/e2b7f68c964756b/test/integration/scripting_spec.js:661:16)
        at process._tickCallback (internal/process/next_tick.js:68:7)
  Message:
[31m    In firefox: Expected 'rgb(255, 0, 0)' to equal 'rgb(0, 255, 0)'.[0m
  Stack:
    Error: In firefox: Expected 'rgb(255, 0, 0)' to equal 'rgb(0, 255, 0)'.
        at <Jasmine>
        at Promise.all.pages.map (/home/ubuntu/pdfjs/botio-files-pdfjs/private/e2b7f68c964756b/test/integration/scripting_spec.js:667:16)
        at process._tickCallback (internal/process/next_tick.js:68:7)
  Message:
[31m    In firefox: Expected 'rgb(0, 255, 0)' to equal 'rgb(0, 0, 255)'.[0m
  Stack:
    Error: In firefox: Expected 'rgb(0, 255, 0)' to equal 'rgb(0, 0, 255)'.
        at <Jasmine>
        at Promise.all.pages.map (/home/ubuntu/pdfjs/botio-files-pdfjs/private/e2b7f68c964756b/test/integration/scripting_spec.js:676:16)
        at process._tickCallback (internal/process/next_tick.js:68:7)
  Message:
[31m    In firefox: Expected 'rgb(0, 0, 255)' to equal 'rgb(255, 0, 0)'.[0m
  Stack:
    Error: In firefox: Expected 'rgb(0, 0, 255)' to equal 'rgb(255, 0, 0)'.
        at <Jasmine>
        at Promise.all.pages.map (/home/ubuntu/pdfjs/botio-files-pdfjs/private/e2b7f68c964756b/test/integration/scripting_spec.js:661:16)
        at process._tickCallback (internal/process/next_tick.js:68:7)
  Message:
[31m    In firefox: Expected 'rgb(255, 0, 0)' to equal 'rgb(0, 255, 0)'.[0m
  Stack:
    Error: In firefox: Expected 'rgb(255, 0, 0)' to equal 'rgb(0, 255, 0)'.
        at <Jasmine>
        at Promise.all.pages.map (/home/ubuntu/pdfjs/botio-files-pdfjs/private/e2b7f68c964756b/test/integration/scripting_spec.js:667:16)
        at process._tickCallback (internal/process/next_tick.js:68:7)
  Message:
[31m    In firefox: Expected 'rgb(0, 255, 0)' to equal 'rgb(0, 0, 255)'.[0m
  Stack:
    Error: In firefox: Expected 'rgb(0, 255, 0)' to equal 'rgb(0, 0, 255)'.
        at <Jasmine>
        at Promise.all.pages.map (/home/ubuntu/pdfjs/botio-files-pdfjs/private/e2b7f68c964756b/test/integration/scripting_spec.js:676:16)
        at process._tickCallback (internal/process/next_tick.js:68:7)
  Message:
[31m    In firefox: Expected 'rgb(0, 0, 255)' to equal 'rgb(255, 0, 0)'.[0m
  Stack:
    Error: In firefox: Expected 'rgb(0, 0, 255)' to equal 'rgb(255, 0, 0)'.
        at <Jasmine>
        at Promise.all.pages.map (/home/ubuntu/pdfjs/botio-files-pdfjs/private/e2b7f68c964756b/test/integration/scripting_spec.js:661:16)
        at process._tickCallback (internal/process/next_tick.js:68:7)
  Message:
[31m    In firefox: Expected 'rgb(255, 0, 0)' to equal 'rgb(0, 255, 0)'.[0m
  Stack:
    Error: In firefox: Expected 'rgb(255, 0, 0)' to equal 'rgb(0, 255, 0)'.
        at <Jasmine>
        at Promise.all.pages.map (/home/ubuntu/pdfjs/botio-files-pdfjs/private/e2b7f68c964756b/test/integration/scripting_spec.js:667:16)
        at process._tickCallback (internal/process/next_tick.js:68:7)
  Message:
[31m    In firefox: Expected 'rgb(0, 255, 0)' to equal 'rgb(0, 0, 255)'.[0m
  Stack:
    Error: In firefox: Expected 'rgb(0, 255, 0)' to equal 'rgb(0, 0, 255)'.
        at <Jasmine>
        at Promise.all.pages.map (/home/ubuntu/pdfjs/botio-files-pdfjs/private/e2b7f68c964756b/test/integration/scripting_spec.js:676:16)
        at process._tickCallback (internal/process/next_tick.js:68:7)
  Message:
[31m    In firefox: Expected 'rgb(0, 0, 255)' to equal 'rgb(255, 0, 0)'.[0m
  Stack:
    Error: In firefox: Expected 'rgb(0, 0, 255)' to equal 'rgb(255, 0, 0)'.
        at <Jasmine>
        at Promise.all.pages.map (/home/ubuntu/pdfjs/botio-files-pdfjs/private/e2b7f68c964756b/test/integration/scripting_spec.js:661:16)
        at process._tickCallback (internal/process/next_tick.js:68:7)
  Message:
[31m    In firefox: Expected 'rgb(255, 0, 0)' to equal 'rgb(0, 255, 0)'.[0m
  Stack:
    Error: In firefox: Expected 'rgb(255, 0, 0)' to equal 'rgb(0, 255, 0)'.
        at <Jasmine>
        at Promise.all.pages.map (/home/ubuntu/pdfjs/botio-files-pdfjs/private/e2b7f68c964756b/test/integration/scripting_spec.js:667:16)
        at process._tickCallback (internal/process/next_tick.js:68:7)
  Message:
[31m    In firefox: Expected 'rgb(0, 255, 0)' to equal 'rgb(0, 0, 255)'.[0m
  Stack:
    Error: In firefox: Expected 'rgb(0, 255, 0)' to equal 'rgb(0, 0, 255)'.
        at <Jasmine>
        at Promise.all.pages.map (/home/ubuntu/pdfjs/botio-files-pdfjs/private/e2b7f68c964756b/test/integration/scripting_spec.js:676:16)
        at process._tickCallback (internal/process/next_tick.js:68:7)
```
pages.map(async ([browserName, page]) => {
          const expected = [
            ["#\\39 0R", "Check5=Yes1::9"],
            ["#\\39 1R", "Check5=Yes2::10"],
            ["#\\39 2R", "Check5=Yes3::11"],
            ["#\\39 3R", "Check5=Yes4::12"],
            ["#\\39 3R", "Check5=Off::12"],
          ];
          for (const [selector, expectedText] of expected) {
            
            await clearInput(page, "#\\38 0R");
            await page.click(selector);
            await page.waitForFunction(
              `document.querySelector("#\\\\38 0R").value !== ""`
            );
            const text = await page.$eval("#\\38 0R", el => el.value);
            expect(text).withContext(`In ${browserName}`).toEqual(expectedText);
          }
        })
      );
    });
    it("must show values in a text input when clicking on checkboxes or radio with no actions", async () => {
      await Promise.all(
        pages.map(async ([browserName, page]) => {
          const expected = [
            ["", "Off;Off"],
            ["#\\39 4R", "Yes;Off"],
            ["#\\39 5R", "Yes;NoAct2"],
            ["#\\39 6R", "Yes;NoAct3"],
            ["#\\39 4R", "Off;NoAct3"],