Firefox Community Forum

My homepage saved sites are just not showing anymore when I start Mozilla or open a new tab. They are still saved but they are not showing up at all, I have checked about:config and everything is still there. I have tried following things: 1. restart Mozilla 2. restart PC 3. refresh Mozilla (this worked... for 1 day, I had to manually put all the saved sites again but they again disappeared when I turned on PC the next day)

However, if I enter troubleshoot mode, everything is still there and working. So I assumed it is an extension or a theme problem, which would be a great solve if I had any really. I have no extensions and I use the same basic theme that I start with. So I tried disabling hardware acceleration, didn't work. I am running out of ideas really other than switching to Chrome at this point.

Attaching files to show the issue. Not shown is the regular mode, the shown one is the troubleshoot mode

I am receiving pop-up messages indicating CRITICAL ERROR! and "Click here to remove them!" followed by a URL ending with velonexa.com They appear as though they are from Mozilla, but we know better. I try to close the window and, of course, without clicking the url or the Dismiss button, but they keep reappearing. There are three stacked windows, constantly appearing as the pop-up windows are closed. Any thoughts or recommendations to eliminate? I've tried shutting down and rebooting. Pretty confident these are not from you. They are also always on top. I try to do a screen capture or print screen and i only capture what is behind them.

I know this is not generated by Mozilla, but thought you should at least be aware of them.

Error message: the bookmarks and history system will no be functional because one of Firefox's files is in use by another application. Some security software can cause this problem.

I tried following the directions in "learn more" but to no avail. Please help this senior citizen get his bookmarks back! Thank you.

I am not able to access my emails in Yahoo Mail. Can't even send emails. Tried accessing Yahoo Mail using Chrome and did not encounter any accessibility problems.

I’ve been troubleshooting a strange networking issue in Firefox that I haven’t been able to pin down, and it seems to be specific to Firefox’s network stack rather than my system or connection.

On several high-traffic sites that sit behind Cloudflare (Discord, Shopify storefronts, some SaaS dashboards), Firefox occasionally stalls during page load. The request shows up in the Network panel as pending for several seconds before finally completing. Sometimes the page partially renders and then hangs until the stalled requests finish.

A few things that make this confusing:

• The same sites load instantly in Chromium-based browsers on the same machine and network • The issue persists even in Firefox Troubleshoot Mode with extensions disabled • DNS over HTTPS on/off does not appear to change behavior • Packet captures show the TCP connection is established quickly, but some HTTP/2 streams appear to wait before data begins flowing • If I force HTTP/1.1 using a proxy for testing, the issue disappears

System details:

OS: Windows 11 Firefox: latest stable release Connection: fiber, low latency, no packet loss locally No system proxy configured

Things I’ve already tried:

• Clearing cache and site data • New Firefox profile • Disabling hardware acceleration • Testing with network.http.http2.enabled toggled • Comparing HAR logs with Chromium

One thing I noticed in the Firefox networking logs is that multiplexed streams sometimes wait behind earlier streams longer than expected, almost like there’s some internal prioritization or queue behavior happening. I’m wondering whether this could be related to HTTP/2 prioritization logic, connection coalescing, or how Firefox handles Cloudflare edge endpoints.

Has anyone seen similar behavior or knows whether there are any advanced networking prefs in about:config worth experimenting with (connection limits, HTTP/2 concurrency, etc.)?

Curious if this might be a known quirk with certain CDNs or just something unique to my environment.

I have never ever had a problem getting into my bank account until this evening.

Says it is insecure.

How can this happen? I really need to get into my account!

Hi, I'm Albert.

I had like 10,000 open tabs (not exaggerating) and these tabs are gone after a blue screen error and a few Windows updates. I want to restore those tabs, but I can not because the "Restore the previous session" option is grayed out.

Are there ways to restore these open tabs?

If there isn't one, then I want to restore all the websites I have visited over the past few years and manually filter them.

How do I do it?

The Firefox library contains history but the oldest history it contains is 2024 December one. I guess the dedicated folder removed my old browsing history as it was filled up?

What I read is that places.sqlite file contains all the browsing history. Is this right? My places.sqlite file size is 80.0 MB (83,886,080 bytes). Is there a size limit on this file? I wonder if this file contains all my browsing history.

I have my places.sqlite file and DB Browser installed on my computer. But I don't know what to do next after opening places.sqlite file.

If there are better suited applications for my purpose than DB Browser, please recommend me one with a little instruction.

Long story short, how do I restore my open tabs or browsing history?

Please help me.