Attach (recommended) or Link to PDF file here: [A3_Quer.pdf](https://github.com/mozilla/pdf.js/files/7373152/A3_Quer.pdf)


**Configuration:**

- Web browser and its version: Firefox 93.0
- Operating system and its version: macOS 11.6
- PDF.js version: 2.5.207
- Is a browser extension: no

**Steps to reproduce the problem:**
1. Open the attached file in Firefox

We discovered this issue in on older version of this library, but it can be reproduced in the current version of Firefox.

**What is the expected behavior? (add screenshot)**
The file should be rendered with a linear gradient as a background:
![Bildschirmfoto 2021-10-19 um 14 34 00](https://user-images.githubusercontent.com/8649002/137910027-07947e34-700b-4692-b225-d38c36da0d37.png)


**What went wrong? (add screenshot)**
The file is rendered without any background:
![Bildschirmfoto 2021-10-19 um 14 35 05](https://user-images.githubusercontent.com/8649002/137910215-a6b8fb9e-ff95-49f0-93b4-c9f127bd49c1.png)



**Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):**
none
constructor(stream, context) {
    this.stream = stream;
    this.context = context;
    this.buffer = 0;
    this.bufferLength = 0;
    const numComps = context.numComps;
    this.tmpCompsBuf = new Float32Array(numComps);
    const csNumComps = context.colorSpace.numComps;
    this.tmpCsCompsBuf = context.colorFn
      ? new Float32Array(csNumComps)
      : this.tmpCompsBuf;
  }
  get hasData() {
    if (this.stream.end) {
      return this.stream.pos < this.stream.end;
    }
    if (this.bufferLength > 0) {
      return true;
    }
    const nextByte = this.stream.getByte();
    if (nextByte < 0) {
      return false;
    }
    this.buffer = nextByte;
    this.bufferLength = 8;
    return true;
  }
  readBits(n) {