Other browsers have quietly added AI page summaries over the past couple of years. Firefox decided to make you work for it instead. Mozilla’s Firefox shake to summarize feature first showed up on iPhone last year. It’s now rolling out to Android too. Shake your phone while reading a long article, and Firefox generates a quick summary. No more scrolling through the whole thing just to find the point.
You don’t actually have to shake anything if that feels silly in public. Tapping the lightning bolt icon in the address bar works just as well. There’s also a Summarize Page option tucked into the three-dot menu. On Android, every summary runs through Mozilla’s cloud-based AI. There’s no on-device option like Apple Intelligence to lean on here. Mozilla picked the Mistral Small 3.1 model to handle that job.
There are limits worth knowing about. The Firefox shake to summarize feature only works on pages under 5,000 words, and paywalled content is off the table. Private browsing mode isn’t supported yet either, and summaries are currently English only.
Some Rough Edges Already
Early testing hasn’t gone perfectly smooth. At least one reviewer ran into a “Can’t summarize right now” error on a Pixel 8. The app still threw that error even after a restart. That points to a staged rollout more than a broken feature, but it’s worth setting expectations if it doesn’t work right away.
If you’d rather skip the gesture, Firefox lets you turn off just the shake trigger while keeping tap-based summaries active. You can also disable page summaries entirely under Settings. Worth noting that Chrome’s Gemini overlay has offered a near-identical summary shortcut on Android for almost two years, minus any gesture. Shaking your phone is really the only new idea in Firefox shake to summarize, not the AI part underneath it.
Firefox for Android has been picking up small AI touches all year, and this one’s at least memorable. If the shake doesn’t work, there’s always the much less exciting tap.
