Firefox Community Forum

I routinely am not able to open registration to conferences or other links to long web addresses. This screen message from Firefox appears:

"Server Not Found

Firefox can’t connect to the server at gi9zc6sab.cc.rs6.net. What can you do about it?

   Check to make sure you’ve typed the website address correctly and try again in a few moments.
   Check your network connection.
   Check that Firefox has permission to access the web (you might be connected but behind a firewall).

That message appeared for this https://gi9zc6sab.cc.rs6.net/tn.jsp?f=001T5esaGIPGizJmjnFH_ZN0rs2nRmFvfg68IUb5lZCQmIAPWdC8rFl0Y1xbniCS0F-q4zVJMAgN3whbcuThS0wDfZevAHUBUCIbKas_wNb6IUJRAHRhiCDsq5_kmYDK-Gwv2w6vv76FnR39uAtOCKdr_ttlxoNJN7WIwMD4ZlQBENHQ920CL4dvvDmhESGhC9TSU-FvwD5zS2y1m0fjSgUiuFw0HzjsTjKMljdebV-fUXu5pxZFF4nQqJ156RWpzEzobANY217MXdmMlwqBqX_1EoztmWAB2LfNJz-Z-9ZVVejG_saHWKFvdbZ2BrQlX4Y1fpYrTz5Xzx8AvB4ybvXJA==&c=yp6c6A5fB7yDTLMvkly_lvoPm2JVn0awZB8o-xRVaJpx_MPafsrX3A==&ch=c_dP5vdY4uwNFMGk8OzrTttJtbNgGv0RSdMckxp2d-NbUWrheIutEQ==

That long link was embedded in this conference announcement:

Join the Connecticut Institute for Resilience and Climate Adaptation

for our annual summit at the

UConn School of Law, Hartford, CT

Friday, November 20, 2026

9:15 am – 2:30 pm

Agenda

8:45-9:15: Registration and Coffee

9:15–9:25: Welcome Remarks

9:25–9:50: CIRCA Update Presentation

9:50-10:35: Legislative Implementation Presentations

o 9:50–10:00: Resilience Improvement Districts

o 10:00–10:10: Stormwater Authorities

o 10:10–10:20: Climate Change and Coastal Resilience Reserve Funds o 10:20–10:35: Question and Answers

10:35–10:45 Break

10:45–11:00: Keynote Address

11:00–12:00: Legislative Panel

12:00–1:00: Lunch

1:00–2:10: Resilience on the Ground and In the Water Panel

2:10–2:30: Networking

Since space is limited, registration will close on November 10, 2026.

Please join us to work toward a more Resilient Connecticut!

EVENT WEBSITE

For more information and

I have cleared all logins and ALL browser cache and cookies, checked for updated version (running 155.0.1 for Mac OS) and restarted the browser. But still get a BAD REQUEST error when trying to access someone's Calendly page. I can load the main website of Calendly, but it will not load specific person's calendar.

I tested this in Chrome and in Safari and there are no issues loading someone's Calendly page. Here is an example account. https://calendly.com/rickcoughlin

I have also tried this in Private Mode. Can someone help?

When accessing the main search page my android phone is briefly loading an image of the Firefox logo that is all purple. It then starts loading the main search page. When I try to open a pinned site it is very slow and times out frequently. I'm concerned that I have a virus.

latest update seems to have broken firefox 155.0.1. It opens but then becomes unresponsive. Two different PC, both win 10. How can I revert to previous?

I can not get extra info from troubleshooting page cause FF won't open so as to be used.

سلام. من میخواهم بدانم چطور باید در فایرفاکس مسدود کننده تبلیغات را تنظیم کنم. آیا اصلا راهی وجود دارد؟ به وب سایتی رفتم که گفته مسدود کننده تبلیغات من روشن است و با آن نمیتواند اجرا شود. لطفا کمک کنید تا بتوانم آن را خاموش کنم. با تشکر

System: Linux Mint 22.3 Xfce Firefox web-browser: mint-001 - 1.0 _ 155.0.1 (64-bit) Hardware: Both on my Desktop and Laptop computers.

Since the recent updates, 1-2 weeks, every time I try to enter a character via Unicode insertion, CTRL+ALT+U, the character does not insert but a row break. I made a video about it: https://youtu.be/OP9UCGpZdEc

This happens in every website I use; mostly likely on every website.

Is there anything I can do now?

Thank you for your time reading this. 🙇

I want University Of The People student app restored on my new Mozila Firefox with Yahoo mail.com. I am a student and may drop out if I loose the contents I am asking for.

Hi Mozilla Support Team,

We are testing our commuter booking web application (carliftdubaitoabudhabiae.com) on Firefox for Android (v128+).

Our web app relies on real-time Geolocation APIs to show passengers their pickup points and Web Push Notifications for schedule updates. However, we are noticing a few technical issues specific to Firefox Mobile:

Geolocation Prompt Delay: When users open the booking map, the browser location permission prompt takes 4–5 seconds to load compared to Chrome.

PWA Service Worker Caching: After updating route schedules on the server, Firefox Mobile sometimes serves stale cached assets even after clear cache commands.

Are there specific Service Worker or Manifest configurations recommended for Firefox Mobile to ensure fast real-time location updates for transport web apps?

Thanks for any technical guidance!

After a update 154.0.1 and 155.0.1, 64 byt Firefox dod not keep the open tabs once started, but the bookmarks. After searching in Firefox help, neither I could not find a previous bakup folder, before the update data, so I cannot restore the history it manually, so I do not know what to do. It is quite dissapointing as I had dozens of tabs open for diferent putposes, and now I have no one

Is there a way to remove "recent bookmarks" from the book marks pull down menu? Or at least hide them. It causes a total lack of privacy when any and all bookmarks can be seen in full view. Seems a stupid thing to not be able to hide them. Other browsers only show book marks when you go to the folder they are in.