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Why would I get server cannot be contacted after a few hours of browsing?

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Note: This is a repost from https://support.mozilla.org/en-US/questions/1057273

I've had this problem for several years, probably going back to v15 or so. Firefox loads and works fine for a while. Then, suddenly, for reasons I do not understand, it refuses to load any more webpages. I get a "server cannot be found" error. It's like Firefox forgets how to do an IP lookup, or gets a bogus answer that redirects to an IP that is bogus. It doesn't wait or timeout either. Once I get it once I cannot browse to any website until I close Firefox and reopen the program. Even opening new browser tabs or windows doesn't help. I have to completely exit Firefox (all instances).

I would like to note that if it is "about to break", when I click a link, bookmark, or type in the web address, when I hit enter it fails within a second or two. It doesn't sit around and timeout after 30 seconds.

I don't feel like I'm doing anything that is out of the ordinary. I have a few plugins, but this happens on multiple computers, including some that have no plugins installed.

Here's things that may be affecting this behavior for me:

1. I use a hosts file to block a lot of spammy websites. I use a program called hostsman to handle the hosts file. I have the Windows DNS caching service disabled because it cannot handle the number of entries that are in the hosts file. (been using this for more than 10 years) 2. I have disabled disk caching (I use an SSD and I have found that disk caching creates more problems for browsing than its worth). I still do the in-RAM caching, and it's not uncommon for Firefox to be using 1GB of RAM or so. I don't think I've ever seen it use more than about 1.2GB of RAM. All of the systems have massive amounts of free RAM. My main desktop has 64GB of RAM, with 75-80% of it free typically.

I've also seen this at different physical locations (home, work, other side of the country at friend's house's, etc.). This problem only affects Firefox. I haven't seen it on Chrome or Internet explorer (albeit I don't use them for hours on end). I typically have this issue a few times a day. I do work from home, and most of my work is in the browser, so it can be a bit annoying.

Right now my hardware on this machine is:

Lenovo Y55 with 16GB of RAM, i7-4700HQ and 512GB SSD. Other systems are far more powerful than this one, so I tend to think that hardware is not the problem.

I recently had to do a reinstall of my OS on my laptop, and without importing bookmarks/profiles, making any settings changes to Firefox, etc I can have this issue. The system hadn't been setup for 24 hours before I saw this issue first. I did have my ad blocking host file setup, but I hadn't done any serious internet usage (hence no profile import from firefox sync) because I was still trying to setup the software. In any case, I'm having these issues before I even do any kind of 'setup' of firefox to work the way I want it. So I'm very inclined to think this is some kind of weird behavior with DNS querying.

Currently this issue is so severe that if I cannot get some kind of workaround, i'm going to have to switch to another browser before the end of the week. I cannot be running into this issue every 10-30 minutes and have to stop all work in all of my browser tabs to deal with this.

So what information can I get to help isolate this issue? Should I simply open a bug ticket?

Thanks.

Note: This is a repost from https://support.mozilla.org/en-US/questions/1057273 I've had this problem for several years, probably going back to v15 or so. Firefox loads and works fine for a while. Then, suddenly, for reasons I do not understand, it refuses to load any more webpages. I get a "server cannot be found" error. It's like Firefox forgets how to do an IP lookup, or gets a bogus answer that redirects to an IP that is bogus. It doesn't wait or timeout either. Once I get it once I cannot browse to any website until I close Firefox and reopen the program. Even opening new browser tabs or windows doesn't help. I have to completely exit Firefox (all instances). I would like to note that if it is "about to break", when I click a link, bookmark, or type in the web address, when I hit enter it fails within a second or two. It doesn't sit around and timeout after 30 seconds. I don't feel like I'm doing anything that is out of the ordinary. I have a few plugins, but this happens on multiple computers, including some that have no plugins installed. Here's things that may be affecting this behavior for me: 1. I use a hosts file to block a lot of spammy websites. I use a program called hostsman to handle the hosts file. I have the Windows DNS caching service disabled because it cannot handle the number of entries that are in the hosts file. (been using this for more than 10 years) 2. I have disabled disk caching (I use an SSD and I have found that disk caching creates more problems for browsing than its worth). I still do the in-RAM caching, and it's not uncommon for Firefox to be using 1GB of RAM or so. I don't think I've ever seen it use more than about 1.2GB of RAM. All of the systems have massive amounts of free RAM. My main desktop has 64GB of RAM, with 75-80% of it free typically. I've also seen this at different physical locations (home, work, other side of the country at friend's house's, etc.). This problem only affects Firefox. I haven't seen it on Chrome or Internet explorer (albeit I don't use them for hours on end). I typically have this issue a few times a day. I do work from home, and most of my work is in the browser, so it can be a bit annoying. Right now my hardware on this machine is: Lenovo Y55 with 16GB of RAM, i7-4700HQ and 512GB SSD. Other systems are far more powerful than this one, so I tend to think that hardware is not the problem. I recently had to do a reinstall of my OS on my laptop, and without importing bookmarks/profiles, making any settings changes to Firefox, etc I can have this issue. The system hadn't been setup for 24 hours before I saw this issue first. I did have my ad blocking host file setup, but I hadn't done any serious internet usage (hence no profile import from firefox sync) because I was still trying to setup the software. In any case, I'm having these issues before I even do any kind of 'setup' of firefox to work the way I want it. So I'm very inclined to think this is some kind of weird behavior with DNS querying. Currently this issue is so severe that if I cannot get some kind of workaround, i'm going to have to switch to another browser before the end of the week. I cannot be running into this issue every 10-30 minutes and have to stop all work in all of my browser tabs to deal with this. So what information can I get to help isolate this issue? Should I simply open a bug ticket? Thanks.