Frederik Braun �

A web/browser security nerd. Working on security for Firefox and the web at Mozilla. Taught web security at Ruhr Uni Bochum.

I'm often spend my summer on multi-week #bikepacking trips with the family.

The posts here are my own and I do not speak for my employer

Location
Berlin, Germany :club_mate:
Pronouns
he/him
Signal username
freddy.{default HTTPS port}
Frederik Braun �freddy@security.plumbing
2026-02-14

@343max @asante ja, könnte man überlegen..... keine Ahnung wie unbeliebt ich mich machen will und das vorschlagen... :]

Frederik Braun �freddy@security.plumbing
2026-02-14

@asante nur als Zuschauer :)

Frederik Braun �freddy@security.plumbing
2026-02-14

@janl Doing my best to defy them. I think a few new ideas are still out there :)

Frederik Braun �freddy@security.plumbing
2026-02-14

Jetzt lauf ich schon seit 12 Wochen. Drei mal die Woche.

Es ist nicht immer toll, ich find es wirklich nicht das beste der Welt. Aber ich fühle mich weniger schnell erschöpft, wenn ich Treppen laufe oder es sonst eilig habe. Und meine Stimmung ist nach dem Laufen auch echt gut.

Und heute kann ich sagen, ich bin der schnellste Freddy aller Zeiten. Bis jetzt. 😊

Screenshot von meiner Lauf-app. Persönlicher Rekord. Fünf Kilometer in 37 Minuten und 1 Sekunde.
Frederik Braun �freddy@security.plumbing
2026-02-14

Vor ein paar Monaten hat der @343max übers laufen geschrieben (343max.de/posts/laufen/).

Sport war nie etwas für mich. Gleichzeitig wusste ich als Schreibtisch-Nerd auch, dass ich unbedingt etwas für meinen Körper tun sollte. Also kaufte ich mir wirklich einfache, günstige Laufschuhe und wärmende Kleidung. Versand per Express, damit meine mangelnde Motivation mir keinen Strich durch die Rechnung macht.

Frederik Braun �freddy@security.plumbing
2026-02-14
Frederik Braun � boosted:
Firefox Nightlyfirefoxnightly
2026-02-13

As a reminder, you can follow the general Mozilla news, team work and individual contributors work on Planet Mozilla (which has a RSS feed you can subscribe to). We have 1 to 2 blog posts per day on Planet. planet.mozilla.org/

Frederik Braun �freddy@security.plumbing
2026-02-13

Now that we have the infinite monkeys as software, could someone let them know that we don't need someone to write the complete works of Shakespeare again? We have libraries for that.

Frederik Braun � boosted:
Firefox for Web Developersfirefoxwebdevs
2026-02-13

Here's a quick rundown of what we delivered as part of Interop 2025, and what's planned for Interop 2026!

More details on the features and focus areas: hacks.mozilla.org/2026/02/laun

Frederik Braun � boosted:
2026-02-13

Advice if you build websites: Use the W3C HTML *and* CSS validator. Not because I want to tell you that "you're bad if your HTML isn't valid", but because it'll help you find trivial bugs that can make your life hard.
Especially also use the CSS validator. I found 3 issues that made things not work as they should in recent days. I had a bug where it took me a while to figure out why it didn't work til I found some stackoverflow post, and the css validator would've told me right away.

Frederik Braun � boosted:
2026-02-12
Single panel comic.
A person is sitting, slumped over a table with a lemon-juicing machine in front of them. On the right side of the image are many bottles and jars of various sizes, filled with lemon juice. On the left side of the table are piles of lemons waiting to be juiced. More lemons are pelting the person from a large tube above them.
Frederik Braun �freddy@security.plumbing
2026-02-12

What a week, huh?

Frederik Braun � boosted:
2026-02-12

RE: mastodon.social/@sovtechfund/1

If you're a FOSS maintainer working on standards or following them, we would love to hear from you! Please share and boost in your circles.

Frederik Braun � boosted:
Zhuo-Fei Huizfhui
2026-02-11

Last weekend, I jailbroke my Kindle following the instructions from kindlemodding.org/.

It was easier than I expected, and now I can sync all kinds of ebook formats to it and install additional software (e.g., an alternative reader, a Libby client or even Linux).

It made me feel like a proper hacker and inspired me to draw this comic using all the pop culture clichés there are for depicting a *real* hacker. 😄

A comic version of me, sitting behind a desk in a dark grey hoodie and a pair of eye masks. On the table is a laptop with various stickers on it, and a Kindle is connected to the laptop via a cable. Behind me is the famous Matrix wall of green digits.
Frederik Braun � boosted:
Francesco Lodoloflod@fosstodon.org
2026-02-11

RE: fosstodon.org/@flod/1155582060

My team is still hiring (currently interviewing). It's proving hard to find the right candidate for this role.

If you're a strong Python and JS developer, with experience in localization or even an interest on the topic, please apply. We're mainly looking for people located in Europe or Canada (East Coast), to maximize time zone overlap.

Frederik Braun � boosted:
Open Security ConferenceOSCo@infosec.exchange
2026-02-11

To all companies out there that value #CyberSecurity, #Community and #DEI: Are you up for supporting a unique space where all kinds of folks can share and learn together? The Open Security Conference is looking for sponsors!

💜 Our values: opensecurityconference.org/abo
📦 Our sponsor packages: opensecurityconference.org/sup
💬 How to reach out: opensecurityconference.org/con

See you at #osco on November 5-8 in Rückersbach! 🤩

#osco26 #Security #InfoSec #AppSec #OTSecurity [lisi]

Frederik Braun � boosted:
Jan Wildeboer 😷:krulorange:jwildeboer@social.wildeboer.net
2026-02-11

If in the EU. Try WERO and tell your bank how to make it better if you truly care about an alternative to PayPal and the Visa/Master duopoly. Don’t expect the perfect solution. Understand that alternatives are never better or perfect from the get-go but that we need to tell them through using them how to become better and better. Be a pioneer, not a follower :)

wero-wallet.eu

Frederik Braun � boosted:
2026-02-10

Tip: Firefox supports offline and locale translation via the URL bar.
For example:
about:translations#src=en&trg=fr&text=Firefox+can+do+translation+without+network+access
You can explicitly set the source (src) and target (trg) languages.

Frederik Braun �freddy@security.plumbing
2026-02-09
Frederik Braun �freddy@security.plumbing
2026-02-09

@addison @floyd I have a follow up thought. What’s going to happen to open source when there’s an onslaught of credible true positive security bug reports against projects when they are not well staffed? Like the curl problem but with actual bugs and also solo/small team maintainers

Client Info

Server: https://mastodon.social
Version: 2025.07
Repository: https://github.com/cyevgeniy/lmst