Possible Memory Leak

[JoTraGo]

I have a synology DS212 and discovered your Firefox addon a couple of years ago.
I run a linux platform, originally Ubuntu 1204 LTS and more recently since March 2014 Mint 16 on the same Dell Laptop
On both these systems I experienced a situation where firefox would slowly become more and more sluggish, typically freezing for a few seconds at an ever decreasing interval of minutes down to seconds.
Typically I would shut everything down and restart my machine.
This eventually got so annoying I started a more systematic troubleshooting exercise.

Using the System Monitor I discovered that Firefox itself was the cause. over a period of a fews days the memory and cpu utilisation of the FF process would creep up from 4-10% and a couple of Hundred MB to 100%CPU, & 2-3GB Memory
Restarting FF would bring it back to 0-4% & ~150MB.
I then started following the Mozilla Firefox troubleshooting guide, starting by disabling all Extensions, Themes, and Addons.
I don't use any themes, I normally Run with ALL plugins set to Ask to Activate and I disabled all extensions
FF ran happily for many days, Memory Utilisation grew with use from ~150MB to ~600MB and CPU varied from 0% to 50% depending on Firefox activities
One by one I re-enabled my Extensions, Tree StyleTab, Downthemall, DuckDuckGo, & Flash&Video Download and all was well.
When I re-enabled Synoloader, 2 days later FF CPU was up to 100% & Memory 2.5GB
So it is looking like there may be a problem related to Synoloader.

I will test further by disabling other Extensions and run with Only Synoloader.
I also have another laptop running pretty much the same setup, and I will see if that shows the same symptoms

I'll update you with my findings as I go.

[JoTraGo]

20140616
Restart FF but Not Mint
CPU 0% Mem 141MB

Disable all extensions except Synoloader

20140618
Had to go onsite with my laptop so it got restarted
Up to then No problem with only Synoloader extension loaded into FFox
Re-started Laptop at around 17:00 yesterday

at 09:00 today FF was Frozen CPU 100%, Memory 2.1GB
Running overnight with 8 tabs open
Synology DS212 Web Interface with Download Manager auto updating, local
My Router Monitor auto updating, local
Juniper Router Web Management page remote
Zyxel Router Management Page Remote
Zyxel Site Page - Static
Another Zyxel Site Page - static
A blog web page static

I opened the Addons Page to check that Synoloader was the Only extension loaded

As a control, I checked on my other Acer laptop
This has been running, pretty much idle for 1.5 days CPU & Memory for FFox Normal
I opened the DSM Web Management page and opened Download Manager

Returning to my Main Laptop, FFX had freed up, CPU 0-20% 547MB Memory
So in this instance the issue cleared itself.

I am beginning to wonder if this has to do with leaving the Synology DSM interface open for extended periods, with Download Manager Constantly updating (Which I often do to monitor downloads overnight)

[JoTraGo]

As I watch FFox right now the CPU & Memory are creeping up
I have been using two windows earlier, now only one with my two local Device monitoring pages (Router & DS212) Two Remote Router Management Pages - idling, and this page.
Cpu is fluctuating between 10&90% - Memory is now 917MB fluctuating by about 10% but creeping up steadily, it just topped out at 1017MB.
I have taken a memory report from the FFox Troubleshooter and the bulk of it seems to be the "Unclassified Heap"
I have the full file but cannot see how to attach a file to the issue

901.83 MB (100.0%) -- explicit
├──420.04 MB (46.58%) ── heap-unclassified
├──320.57 MB (35.55%) -- window-objects
│ ├──229.68 MB (25.47%) -- top(http://ds212:5000/webman/index.cgi, id=67)
│ │ ├──214.10 MB (23.74%) -- active
│ │ │ ├──213.85 MB (23.71%) -- window(http://ds212:5000/webman/index.cgi)
│ │ │ │ ├──182.21 MB (20.20%) -- dom
│ │ │ │ │ ├──179.69 MB (19.93%) ── orphan-nodes
│ │ │ │ │ └────2.52 MB (00.28%) ++ (5 tiny)
│ │ │ │ ├───19.59 MB (02.17%) -- js-compartment(http://ds212:5000/webman/index.cgi)
│ │ │ │ │ ├──10.51 MB (01.16%) ++ objects
│ │ │ │ │ └───9.08 MB (01.01%) ++ (6 tiny)
│ │ │ │ └───12.05 MB (01.34%) ++ (3 tiny)
│ │ │ └────0.25 MB (00.03%) ++ window(about:blank)
│ │ └───15.57 MB (01.73%) -- js-zone(0x7fb8cd553800)
│ │ ├───9.29 MB (01.03%) ── unused-gc-things
│ │ └───6.29 MB (00.70%) ++ (7 tiny)
│ ├───45.05 MB (05.00%) -- top(#4, id=7466)
│ │ ├──28.20 MB (03.13%) -- cached
│ │ │ ├───9.73 MB (01.08%) ++ window(https://github.com/Lemutar/Synoloader)
│ │ │ ├───9.43 MB (01.05%) ++ window(https://github.com/Lemutar/Synoloader/issues)
│ │ │ └───9.04 MB (01.00%) ++ window(https://github.com/)
│ │ ├──11.21 MB (01.24%) ++ active/window(#4)
│ │ └───5.64 MB (00.63%) ++ js-zone(0x7fb8173cb000)
│ ├───29.54 MB (03.28%) ++ (9 tiny)
│ └───16.31 MB (01.81%) -- top(https://x.x.x.x/login, id=8)
│ ├──12.48 MB (01.38%) ++ active/window(https://x.x.x.x2/login)
│ └───3.83 MB (00.42%) ++ js-zone(0x7fb8dd907800)
├───64.24 MB (07.12%) -- js-non-window
│ ├──39.32 MB (04.36%) -- zones
│ │ ├──29.96 MB (03.32%) ++ zone(0x7fb8ef079800)
│ │ └───9.35 MB (01.04%) ++ (4 tiny)
│ ├──22.86 MB (02.53%) ++ runtime
│ └───2.06 MB (00.23%) ++ gc-heap
├───51.40 MB (05.70%) -- heap-overhead
│ ├──48.57 MB (05.39%) ── waste
│ └───2.83 MB (00.31%) ++ (2 tiny)
├───30.07 MB (03.33%) ++ (20 tiny)
└───15.51 MB (01.72%) -- storage
├──13.52 MB (01.50%) ++ sqlite
└───1.99 MB (00.22%) ++ prefix-set

[JoTraGo]

https://app.box.com/s/98eeixpccd4l6q5jp0gx
Here's the Memory Report

[JoTraGo]

Testing on a second Machine
Acer TravelMate 5730 I Core2Duo 4GB Ram
Linux Mint 16 64 bit Updated not quite so regularly
FFox 29.0 with SYnoloader 1.01

Experience pretty much the same thing, after a couple of days FFox Memory is up to 2.0GB

I am beginning to suspect this may not be directly a problem with Synoloader but more with the DSM Web Interface. I typically leave DSM Running with the Download Manager Monitoring window open, displaying downloads ordered by download speed, which means the display is constantly re-ordering during each refresh every 30 seconds. Obviously this means that FFox is constantly working.
I am going to run a test without Synoloader, and Clean Reset FFox working only with the DSM interface.

[JoTraGo]

Possible False Alarm
After repeating my testing without Synoloader Extension installed I still get the same symptoms, so it is down to the Synology DSM Webmanager with Download Station, and / or FireFox itself.

On one of my machines I updated Mint16 with latest updates, & rebooted.
Firefox updated to 30.0
Reset Firefox to factory defaults, no extensions or anything.
Open The Synology Management pages, and left them running and I still get the Memory Leak.
I also usually have my router management page open showing the list of hosts and their traffic sorted by download speed, so this also updates every 10 seconds.
So as a last test I will run with ONLY the Router page and see if the symptoms re-occur. If so then I must conclude it is a FireFox issue with constantly updating pages. If not then it is probably a Synology issue.