Public bug reported:

I am not sure when exactly this started. I feel like it was around FF
v99.

System is always on. 2 user accounts (mine, wife's). We keep the desktop
sessions logged-in, just switch between accounts whenever needed.
Firefox stays open since it's heavily used. When an active session is
unlocked or switched to after being unused for several hours (not
rigorously measured but I'd say more than 6-8 hours), we observe the
following behavior in Firefox:

* Gmail tab will show a message at the top of the page along the lines of 
"encountered a problem, retrying in 3:00" with the timer counting down
* For the first 10-20s, clicking on another tab will have no effect - FF 
doesn't switch to the tab
* From 20s to between 1-2 minutes:
  - Switching tabs will work albeit slowly.
  - Reloading an existing tab does nothing except cause the side-to-side 
loading indicator on the tab to cycle
  - I am able to open a new tab via ctrl-T
  - I can enter a URL into a new tab, but the site doesn't load. The loading 
indicator cycles in the tab title.
  - I cannot open about:performance to troubleshoot

After some period of time, as short as 30-40s and as long as 2 minutes,
FF becomes usable again. Sites can be loaded/reloaded, etc.

What I have tried, but has not resolved the issue:
* Restart FF in troubleshooting mode
* Upgrade to new releases as they are available in the package manager
* Run in non-troubleshooting mode but with all extensions removed
* Refresh the browser
* Set browser.tabs.unloadOnLowMemory = false
* rm -rf ~/.mozilla and start with a fresh profile

Workaround: killall -9 firefox, then relaunch firefox

Again, this seems to have started suddenly at some point possibly around
the v99 timeframe. Prior to that, I did not observe this problem.
Hardware, and to the best of my knowledge the usage habits of the 2
users, have not changed in quite some time.

I've attached the output of a "vmstat 1" command that I launched when I
unlocked a session that was idle for approximately 40h, before
interacting with the existing firefox session. The firefox issue
manifested for about 1min 20s. Once firefox became usable, I stopped the
vmstat command.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: firefox 104.0+build3-0ubuntu0.20.04.1
ProcVersionSignature: Ubuntu 5.4.0-124.140-generic 5.4.195
Uname: Linux 5.4.0-124-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.11-0ubuntu27.24
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  tyr       743015 F.... pulseaudio
 /dev/snd/controlC1:  tyr       743015 F.... pulseaudio
BuildID: 20220818191623
CasperMD5CheckResult: skip
Channel: Unavailable
CurrentDesktop: XFCE
Date: Thu Sep 15 18:38:25 2022
Extensions: extensions.sqlite corrupt or missing
ForcedLayersAccel: False
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini 
or extensions.sqlite)
InstallationDate: Installed on 2016-01-05 (2444 days ago)
InstallationMedia: Xubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
IpRoute:
 default via 192.168.1.1 dev eth0 proto static metric 100
 192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.100 metric 100
Locales: extensions.sqlite corrupt or missing
PrefErrors: Unexpected character ',' before close parenthesis @ 
/usr/lib/firefox/omni.ja:greprefs.js:302
PrefSources: prefs.js
Profiles: Profile0 (Default) - LastVersion=104.0/20220818191623 (In use)
RunningIncompatibleAddons: False
SourcePackage: firefox
Themes: extensions.sqlite corrupt or missing
UpgradeStatus: Upgraded to focal on 2021-02-04 (588 days ago)
dmi.bios.date: 11/11/2015
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2801
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: Z97-A
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr2801:bd11/11/2015:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnZ97-A:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.family: ASUS MB
dmi.product.name: All Series
dmi.product.sku: All
dmi.product.version: System Version
dmi.sys.vendor: ASUS

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

** Attachment added: "firefox-vmstat.out"
   
https://bugs.launchpad.net/bugs/1989821/+attachment/5616215/+files/firefox-vmstat.out

** Summary changed:

- Firefox hangs, unable to reload tabs after switching to session that was idle 
for several hours
+ Firefox hangs, unable to reload tabs for up to 2min after switching to 
session that was idle for several hours

** Description changed:

  I am not sure when exactly this started. I feel like it was around FF
  v99.
  
  System is always on. 2 user accounts (mine, wife's). We keep the desktop
  sessions logged-in, just switch between accounts whenever needed.
  Firefox stays open since it's heavily used. When an active session is
  unlocked or switched to after being unused for several hours (not
  rigorously measured but I'd say more than 6-8 hours), we observe the
  following behavior in Firefox:
  
  * Gmail tab will show a message at the top of the page along the lines of 
"encountered a problem, retrying in 3:00" with the timer counting down
  * For the first 10-20s, clicking on another tab will have no effect - FF 
doesn't switch to the tab
- * From 20s to between 1-2 minutes: 
-   - Switching tabs will work albeit slowly. 
-   - Reloading an existing tab does nothing except cause the side-to-side 
loading indicator on the tab to cycle 
-   - I am able to open a new tab via ctrl-T
-   - I can enter a URL into a new tab, but the site doesn't load. The loading 
indicator cycles in the tab title.
-   - I cannot open about:performance to troubleshoot
+ * From 20s to between 1-2 minutes:
+   - Switching tabs will work albeit slowly.
+   - Reloading an existing tab does nothing except cause the side-to-side 
loading indicator on the tab to cycle
+   - I am able to open a new tab via ctrl-T
+   - I can enter a URL into a new tab, but the site doesn't load. The loading 
indicator cycles in the tab title.
+   - I cannot open about:performance to troubleshoot
  
  After some period of time, as short as 30-40s and as long as 2 minutes,
  FF becomes usable again. Sites can be loaded/reloaded, etc.
  
  What I have tried, but has not resolved the issue:
  * Restart FF in troubleshooting mode
  * Upgrade to new releases as they are available in the package manager
  * Run in non-troubleshooting mode but with all extensions removed
  * Refresh the browser
  * Set browser.tabs.unloadOnLowMemory = false
  * rm -rf ~/.mozilla and start with a fresh profile
  
  Workaround: killall -9 firefox, then relaunch firefox
  
  Again, this seems to have started suddenly at some point possibly around
  the v99 timeframe. Prior to that, I did not observe this problem.
  Hardware, and to the best of my knowledge the usage habits of the 2
  users, have not changed in quite some time.
  
  I've attached the output of a "vmstat 1" command that I launched when I
  unlocked a session that was idle for approximately 40h, before
- interacting with the existing firefox session.
+ interacting with the existing firefox session. The firefox issue
+ manifested for about 1min 20s. Once firefox became usable, I stopped the
+ vmstat command.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: firefox 104.0+build3-0ubuntu0.20.04.1
  ProcVersionSignature: Ubuntu 5.4.0-124.140-generic 5.4.195
  Uname: Linux 5.4.0-124-generic x86_64
  AddonCompatCheckDisabled: False
  ApportVersion: 2.20.11-0ubuntu27.24
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC0:  tyr       743015 F.... pulseaudio
-  /dev/snd/controlC1:  tyr       743015 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC0:  tyr       743015 F.... pulseaudio
+  /dev/snd/controlC1:  tyr       743015 F.... pulseaudio
  BuildID: 20220818191623
  CasperMD5CheckResult: skip
  Channel: Unavailable
  CurrentDesktop: XFCE
  Date: Thu Sep 15 18:38:25 2022
  Extensions: extensions.sqlite corrupt or missing
  ForcedLayersAccel: False
  IfupdownConfig:
-  # interfaces(5) file used by ifup(8) and ifdown(8)
-  auto lo
-  iface lo inet loopback
+  # interfaces(5) file used by ifup(8) and ifdown(8)
+  auto lo
+  iface lo inet loopback
  IncompatibleExtensions: Unavailable (corrupt or non-existant 
compatibility.ini or extensions.sqlite)
  InstallationDate: Installed on 2016-01-05 (2444 days ago)
  InstallationMedia: Xubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  IpRoute:
-  default via 192.168.1.1 dev eth0 proto static metric 100 
-  192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.100 metric 100
+  default via 192.168.1.1 dev eth0 proto static metric 100
+  192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.100 metric 100
  Locales: extensions.sqlite corrupt or missing
  PrefErrors: Unexpected character ',' before close parenthesis @ 
/usr/lib/firefox/omni.ja:greprefs.js:302
  PrefSources: prefs.js
  Profiles: Profile0 (Default) - LastVersion=104.0/20220818191623 (In use)
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  Themes: extensions.sqlite corrupt or missing
  UpgradeStatus: Upgraded to focal on 2021-02-04 (588 days ago)
  dmi.bios.date: 11/11/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2801
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: Z97-A
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr2801:bd11/11/2015:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnZ97-A:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.family: ASUS MB
  dmi.product.name: All Series
  dmi.product.sku: All
  dmi.product.version: System Version
  dmi.sys.vendor: ASUS

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to firefox in Ubuntu.
https://bugs.launchpad.net/bugs/1989821

Title:
  Firefox hangs, unable to reload tabs for up to 2min after switching to
  session that was idle for several hours

Status in firefox package in Ubuntu:
  New

Bug description:
  I am not sure when exactly this started. I feel like it was around FF
  v99.

  System is always on. 2 user accounts (mine, wife's). We keep the
  desktop sessions logged-in, just switch between accounts whenever
  needed. Firefox stays open since it's heavily used. When an active
  session is unlocked or switched to after being unused for several
  hours (not rigorously measured but I'd say more than 6-8 hours), we
  observe the following behavior in Firefox:

  * Gmail tab will show a message at the top of the page along the lines of 
"encountered a problem, retrying in 3:00" with the timer counting down
  * For the first 10-20s, clicking on another tab will have no effect - FF 
doesn't switch to the tab
  * From 20s to between 1-2 minutes:
    - Switching tabs will work albeit slowly.
    - Reloading an existing tab does nothing except cause the side-to-side 
loading indicator on the tab to cycle
    - I am able to open a new tab via ctrl-T
    - I can enter a URL into a new tab, but the site doesn't load. The loading 
indicator cycles in the tab title.
    - I cannot open about:performance to troubleshoot

  After some period of time, as short as 30-40s and as long as 2
  minutes, FF becomes usable again. Sites can be loaded/reloaded, etc.

  What I have tried, but has not resolved the issue:
  * Restart FF in troubleshooting mode
  * Upgrade to new releases as they are available in the package manager
  * Run in non-troubleshooting mode but with all extensions removed
  * Refresh the browser
  * Set browser.tabs.unloadOnLowMemory = false
  * rm -rf ~/.mozilla and start with a fresh profile

  Workaround: killall -9 firefox, then relaunch firefox

  Again, this seems to have started suddenly at some point possibly
  around the v99 timeframe. Prior to that, I did not observe this
  problem. Hardware, and to the best of my knowledge the usage habits of
  the 2 users, have not changed in quite some time.

  I've attached the output of a "vmstat 1" command that I launched when
  I unlocked a session that was idle for approximately 40h, before
  interacting with the existing firefox session. The firefox issue
  manifested for about 1min 20s. Once firefox became usable, I stopped
  the vmstat command.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: firefox 104.0+build3-0ubuntu0.20.04.1
  ProcVersionSignature: Ubuntu 5.4.0-124.140-generic 5.4.195
  Uname: Linux 5.4.0-124-generic x86_64
  AddonCompatCheckDisabled: False
  ApportVersion: 2.20.11-0ubuntu27.24
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  tyr       743015 F.... pulseaudio
   /dev/snd/controlC1:  tyr       743015 F.... pulseaudio
  BuildID: 20220818191623
  CasperMD5CheckResult: skip
  Channel: Unavailable
  CurrentDesktop: XFCE
  Date: Thu Sep 15 18:38:25 2022
  Extensions: extensions.sqlite corrupt or missing
  ForcedLayersAccel: False
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  IncompatibleExtensions: Unavailable (corrupt or non-existant 
compatibility.ini or extensions.sqlite)
  InstallationDate: Installed on 2016-01-05 (2444 days ago)
  InstallationMedia: Xubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  IpRoute:
   default via 192.168.1.1 dev eth0 proto static metric 100
   192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.100 metric 100
  Locales: extensions.sqlite corrupt or missing
  PrefErrors: Unexpected character ',' before close parenthesis @ 
/usr/lib/firefox/omni.ja:greprefs.js:302
  PrefSources: prefs.js
  Profiles: Profile0 (Default) - LastVersion=104.0/20220818191623 (In use)
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  Themes: extensions.sqlite corrupt or missing
  UpgradeStatus: Upgraded to focal on 2021-02-04 (588 days ago)
  dmi.bios.date: 11/11/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2801
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: Z97-A
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr2801:bd11/11/2015:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnZ97-A:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.family: ASUS MB
  dmi.product.name: All Series
  dmi.product.sku: All
  dmi.product.version: System Version
  dmi.sys.vendor: ASUS

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