Firefox : TTS finishes playing current passage some time after pressing pause

**Description**

> What problem are we solving? What does the experience look like today? What are the symptoms? How can one reproduce the problem?

Playback continues even after pressing pause.. Then once the passage is finished playback finally stops.

**Evidence / Screenshot (if possible)**

> Include evidence of the problem or provide a screenshot.

https://github.com/user-attachments/assets/5ca0dc4c-3c6a-490f-a992-747bf1f3648e

**Expectation**

> What should be happening? What will it look like / how will it behave when fixed?

Playback supposed to pause right when we hit on pause

**Context**

> What operating system? What browser type and version?

Firefox+linux

**Proposal & Constraints**

> What is the proposed solution / implementation? Is there a precedent of this approach succeeding elsewhere?

**Stakeholders**

> @cdrini