Logitech MX Master 3S side buttons don't work for browser navigation

[jcbrizu]

When using the side buttons (thumb buttons) on a Logitech MX Master 3S for browser navigation, they don't behave as expected:

Back button: zooms the page instead of navigating back
Forward button: does nothing

Expected behavior: Side buttons should trigger browser back/forward navigation.

[linear-code]

OLG-8

[pullfrog]

  ^{｜ Build this ➔ ｜ Make a plan ➔}

[davidbudnick]

@jcbrizu Interesting, I am currently using the MX Master 3S mouse as well and the Browser Forward/ Browser Backward command seems to be working correctly on version v0.2.0

Are you on the latest version of the OpenLogi?

[jcbrizu]

I am, yes. Maybe it’s because my MacOS install is in Spanish? I’m from Argentina maybe regional settings have something to do with it. El El dom, 31 may 2026 a la(s) 20:59, David Budnick < ***@***.***> escribió:

…

*davidbudnick* left a comment (AprilNEA/OpenLogi#23) <#23 (comment)> @jcbrizu <https://github.com/jcbrizu> Interesting, I am currently using the MX Master 3S mouse as well and the Browser Forward/ Browser Backward command seems to be working correctly on version v0.2.0 Are you on the latest version of the OpenLogi? Screenshot.2026-05-31.at.6.57.13.PM.png (view on web) <https://github.com/user-attachments/assets/3017b80e-4e98-4b49-a908-4d717c07f618> — Reply to this email directly, view it on GitHub <#23?email_source=notifications&email_token=AKUOUUM5HYR7QGABZLV4SYT45TBM3A5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTINJYHA3DEMBZGIZ2M4TFMFZW63VHNVSW45DJN5XKKZLWMVXHJLDGN5XXIZLSL5RWY2LDNM#issuecomment-4588620923>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AKUOUUJ3U7UI6MXC6XPDJJL45TBM3AVCNFSM6AAAAACZUZKAMOVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHM2DKOBYGYZDAOJSGM> . Triage notifications, keep track of coding agent tasks and review pull requests on the go with GitHub Mobile for iOS <https://github.com/notifications/mobile/ios/AKUOUUMJCDE2J7HXX2FMN2345TBM3A5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTINJYHA3DEMBZGIZ2M4TFMFZW63VHNVSW45DJN5XKKZLWMVXHJKTGN5XXIZLSL5UW64Y> and Android <https://github.com/notifications/mobile/android/AKUOUUKGFL7SWYAB6WSAECT45TBM3A5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTINJYHA3DEMBZGIZ2M4TFMFZW63VHNVSW45DJN5XKKZLWMVXHJLTGN5XXIZLSL5QW4ZDSN5UWI>. Download it today! You are receiving this because you were mentioned.Message ID: ***@***.***>

[davidbudnick]

I am, yes. Maybe it’s because my MacOS install is in Spanish? I’m from
Argentina maybe regional settings have something to do with it.

El El dom, 31 may 2026 a la(s) 20:59, David Budnick <
@.***> escribió:
…

Langauge should have nothing to do with the buttons being linked to Forward/Backwards in the browser. But in the name of Spanish I have a PR open right now to add support for it! #24

RE your issue, maybe try to uninstall the application and ensure you have Options+ removed from your Mac :)

[jcbrizu]

Some debugging notes from my machine (MX Master 3S via Bolt receiver, macOS 26), in case they help whoever picks this up.

The side buttons never reach the CGEventTap hook. With OpenLogi managing the device (gesture + DPI diverted over HID++), pressing the thumb rocker produces no OtherMouseDown at the HID tap location — in my testing not even the middle/wheel click came through. And with no Logitech software running at all, the side buttons do nothing in the browser either. So macOS isn't delivering this 3S's Back/Forward over BTLE as standard mouse buttons 3/4 that button_number_to_id expects.

The "Back zooms" in my original report seems to have been the previously-installed Logi Options+ (and/or onboard config); once everything was uninstalled the rocker is simply inert.

Device identity over BTLE, for reference (openlogi list):

slot 2 ● MX Master 3S (mouse, wpid=b034) model_ids=[b034,0000,0000] ext=01 transports=btle

This points at the Back/Forward rocker needing to be captured/diverted over HID++ (like the gesture button already is) rather than relying on the CGEventTap, at least for BTLE-connected units. I couldn't fully confirm exactly what the rocker emits, because granting Accessibility to an unsigned local dev build is unreliable on macOS (the permission doesn't refresh in-process) — a signed build would make that diagnosis straightforward.

Separately I opened #26, which fixes the missing device image for this same 3S (a codename ↔ modelId mismatch over BTLE).