A Firefox component works erratically on Android, which can cause performance and battery life crashes.

The operation of the Firefox browser seems to be causing problems on Android. The consequence for users: a potential drop in performance, an overheating of the device and a drop in autonomy.

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A Bugzilla page spotted by Android Authority details the problem. The Glean is used by for telemetry and data analysis purposes. It allows developers to get feedback on user behavior on Firefox, allowing them to identify what is not optimal and improve the browser. But Glean's behavior causes problems on Android devices.

FIREFOX AND AND ANDROID ARE NOT CLEANING
According to Markus Stange, the author of the post BugZilla, any new input of a telemetry data via Glean is accompanied by a significant cost in CPU time and a considerable disk writing. The processor and the storage of the device become submerged as soon as an action is performed with the browser. This can cause a greater need for resources, leading to thettling of the device, and therefore to a drop in performance and autonomy.

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During a test carried out with a Pixel 6, the opening of the web page of cnn.com caused 32,000 writes, at 0.5 ms of CPU time each, thus equivalent to 16.5 seconds of CPU time for the simple loading of a press site. Then, new writes are necessary to scroll the page, launch a video, press a link...

This impact of Firefox on our Android smartphones occurs for two reasons:

On Android, telemetry data updates are not grouped together. Each update results in a write in the Glean database.
The Glean database uses the rkv container in secure mode. This implies that with each update, even the smallest, the entire database is serialized on the disk.

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With the problem identified, we can only hope that deploys a patch soon. The only large browser that doesn't use Chromium shouldn't be the least effective on Android. If you notice performance and battery life on your device that is below what it should be, you can try uninstalling Firefox temporarily until the problem is resolved.

Problem on your Android smartphone? This app may be the cause