Apparently a bug in the "always appear" bookmarks bar

[Serial.com]

Hey guys

Thank you for allowing me to participate in the TorBrowser Forum.
I’ve read some late night posts and some early morning posts and I’m pleased with this recent TB 12.04 release.

As a newbie in this browser and a beginner user of Linux TW, many doubts arise, but first I will report some bugs that I detected when using TB.

OS: openSUSE Tumbleweed x86_64
     Kernel: 6.2.8-1-default
     FROM: GNOME 44.0 
     CPU: Intel i3 540 (4) @ 3067GHz
     Torbrowser browser is updated to version 12.04 (based on Mozilla Firefox 102.9.Oesr) (64-bit)
     Standard security level.

When choosing the favorites bar / always appear, in addition to the bar being shown just below the URL, a giant bar is shown at the bottom of the page, as shown in the image below. I think it’s a small bug. Should that bottom bar exist?

Follow log:

2023-04-02 20:36:03.417 [NOTICE] New control connection opened from 127.0.0.1.
2023-04-02 20:36:03.417 [NOTICE] New control connection opened from 127.0.0.1.
2023-04-02 20:36:03.418 [NOTICE] DisableNetwork is set. Tor will not make or accept non-control network connections. Shutting down all existing connections.
2023-04-02 20:37:35.391 [NOTICE] Opening Socks listener on 127.0.0.1:9150
2023-04-02 20:37:35.392 [NOTICE] Opened Socks listener connection (ready) on 127.0.0.1:9150
2023-04-02 20:37:35.737 [NOTICE] Bootstrapped 5% (conn): Connecting to a relay
2023-04-02 20:37:35.999 [NOTICE] Bootstrapped 10% (conn_done): Connected to a relay
2023-04-02 20:37:36.268 [NOTICE] Bootstrapped 14% (handshake): Handshaking with a relay
2023-04-02 20:37:36.830 [NOTICE] Bootstrapped 15% (handshake_done): Handshake with a relay done
2023-04-02 20:37:36.831 [NOTICE] Bootstrapped 75% (enough_dirinfo): Loaded enough directory info to build circuits
2023-04-02 20:37:36.834 [NOTICE] Bootstrapped 90% (ap_handshake_done): Handshake finished with a relay to build circuits
2023-04-02 20:37:36.837 [NOTICE] Bootstrapped 95% (circuit_create): Establishing a Tor circuit
2023-04-02 20:37:37.814 [NOTICE] Bootstrapped 100% (done): Done
2023-04-02 20:37:38.036 [NOTICE] New control connection opened from 127.0.0.1.
2023-04-02 21:54:45.186 [NOTICE] New control connection opened from 127.0.0.1.
2023-04-02 21:54:46.097 [NOTICE] New control connection opened from 127.0.0.1.
2023-04-02 21:54:48.510 [NOTICE] New control connection opened from 127.0.0.1.
2023-04-02 22:08:24.474 [NOTICE] New control connection opened from 127.0.0.1.
2023-04-02 22:23:41.997 [NOTICE] Your network connection speed appears to have changed. Resetting timeout to 60000ms after 18 timeouts and 502 buildtimes.
2023-04-02 22:53:34.269 [NOTICE] New control connection opened from 127.0.0.1.

[Youlikecheese]

It shall never cease to amaze me how few people know about letterboxing

[championquizzer]

@Serial.com, What are grey bars on resized Tor Browser window? | Tor Project | Support

Tor Browser in its default mode is starting with a content window rounded to a multiple of 200px x 100px to prevent fingerprinting the screen dimensions. The strategy here is to put all users in a couple of buckets to make it harder to single them out. That works so far until users start to resize their windows (e.g. by maximizing them or going into fullscreen mode). Tor Browser ships with a fingerprinting defense for those scenarios as well, which is called Letterboxing, a technique developed by Mozilla and presented in 2019. It works by adding white margins to a browser window so that the window is as close as possible to the desired size while users are still in a couple of screen size buckets that prevent singling them out with the help of screen dimensions.

In simple words, this technique makes groups of users of certain screen sizes and this makes it harder to single out users on basis of screen size, as many users will have same screen size.