Bugzilla

**Environment:**
Operating system: Android 15
Firefox version: Fairfox 143.0

**Steps to reproduce:**
1. Navigate to: https://lilyonthevalley.com/chapter/prt-chapter-5-12/
2. Request "Reader mode" and observe

Browser / Version: Fairfox 143.0
Operating System: Android 15
Tested Another Browser: Yes Firefox

Problem type: Something else
Description: "The Reader Mode feature has stopped working on some websites that I was using just two days ago. Yesterday, I opened a website and clicked on the Reader Mode icon, but the page appears for a moment and then the browser redirects me back to the homepage. Please resolve this issue, as the feature was working fine since I installed the browser. The problem started yesterday, and I kindly request a quick solution because I used to open any website I wanted on Firefox with this feature."
Steps to Reproduce:
Not all stories on the website are unsafe, and I read romantic stories without selecting NSFW content. Secondly, I want to inform you that Firefox used to open any story I liked without issues until last night. Is this feature now preventing me from reading or opening regular stories on the website just because there are other unsafe stories? The settings bar indicates that the website is safe. I was using the browser normally until last Friday, but yesterday, the Reader Mode feature stopped working on this website and another website I mentioned. The browser was updated on 9/8, and there are no new updates available now. I am using Firefox version 143.0. What is the solution to the problem that started yesterday and persists until now? How can I restore the feature to how it was before? Please provide me with a solution or try accessing the website yourselves and selecting any novel using Firefox’s Reader Mode. I downloaded Firefox specifically because the Reader Mode feature allowed me to open any novel from any website I wanted, unlike Google Chrome, where the translation has become poor and inaccurate lately. In contrast, this feature in Firefox enabled me to translate chapters accurately. Now, Firefox’s Reader Mode works on some websites but not others.

**Expected Behavior:**
Reader mode is kept

**Actual Behavior:**
The page reverts back to normal mode

**Notes:**
- Reproduces regardless of the status of ETP
- Reproduces in firefox-nightly, and firefox-release
- Does not reproduce in chrome

Created from https://github.com/webcompat/web-bugs/issues/178926

**Environment:**
Operating system: Android 15
Firefox version: Fairfox 143.0

**Steps to reproduce:**
1. Navigate to: https://lilyonthevalley.com/chapter/prt-chapter-5-12/
2. Request "Reader mode" and observe


**Expected Behavior:**
Reader mode is kept

**Actual Behavior:**
The page reverts back to normal mode

**Notes:**
- Reproduces regardless of the status of ETP
- Reproduces in firefox-nightly, and firefox-release
- Does not reproduce in chrome

Created from https://github.com/webcompat/web-bugs/issues/178926

**Environment:**
Operating system: Android 15
Firefox version: Firefox 143.0

**Steps to reproduce:**
1. Navigate to: https://lilyonthevalley.com/chapter/prt-chapter-5-12/
2. Request "Reader mode" and observe


**Expected Behavior:**
Reader mode is kept

**Actual Behavior:**
The page reverts back to normal mode

**Notes:**
- Reproduces regardless of the status of ETP
- Reproduces in firefox-nightly, and firefox-release
- Does not reproduce in chrome

Created from https://github.com/webcompat/web-bugs/issues/178926