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About me

Developer Information
Name jsmithson
User since Sept. 9, 2012
Number of add-ons developed 0 add-ons
Average rating of developer's add-ons Not yet rated

My Reviews

Toggle JS

Rated 3 out of 5 stars

I thought Firefox ESR (Extended Support Release) update to Mac Firefox ESR 52.5.0 (64 bit) had killed the button...but it turned out that I needed to disable, then re-enable (actually I re-installed) the extension, then quit Firefox and relaunch it. Then the button reappeared and now it works fine.

That's a bit of work to keep this working, and I only discovered it by accident. Perhaps this will help someone else for whom it also stopped working.

Another, minor issue: In my version of Firefox, CTR and custom userchrome.css etc. still doesn't let me affect the size of the buttons in the bottom toolbar. Most of them are (barely) big enough, but this button is really tiny. I can use it because it's green vs. red, but I suppose someone with poor color vision might have a real problem. It would be nice if the button were about twice the size it is; then it would match most of my other toolbar buttons in size.

CSS Viewer

OK, but not as good as the Chrome version Rated 3 out of 5 stars

Although somewhat useful, this extension is not as good as the Chrome extension (of the same name), for a few reasons, including...

The developer has followed the latest brainless design fashion, and grayed-out the interface, making it harder to read or see the information. Actually this is true in the Chrome version too but it's slightly more legible there.

The Escape key doesn't quit it; I have to choose it again (from the button or Tools menu) to make it go away.

The text often doesn't fit in the box and sticks out of its right side, making it even less legible.

It lacks keyboard shortcuts of the Chrome version, such as [f] key to freeze/unfreeze, [c] key to copy CSS selector, etc.

Despite these shortcomings, may be worth installing, but you should check out the Xray bookmarklet as well (which has some overlapping functionality). Hopefully the developer who adapted this from the previous Firefox version (that no longer works) will look at the Chrome version, and try to achieve parity with it.

Tip: I don't know how you access this extension from Windows, but on my Mac... initially I could only access it from the Firefox Tools menu. Using Firefox's Customize mode, I was able to add a button for CSS Viewer to the toolbar as well, which is more convenient. Maybe there's something similar on Windows...

uBlock Origin

Don't update to 1.14.4! Rated 3 out of 5 stars

I'm running Mac Firefox ESR 52.3.0. I had many "cosmetic" custom filters created in UBlock Origin (in "the dashboard"), which were working fine. They represented hours of my work in cleaning up many websites that I visit regularly.

The update to UBO 1.14.4 completely deleted all my filters without warning! I couldn't figure out which exact file they were in so I had to restore my entire FF profile from backup.

After I got my filters back... they didn't work very well. About half of my custom filters were ignored; or they'd work when first created, but as soon as that web page reloaded, they were ignored.

On UBO's github page, I discovered that this problem was discovered, discussed, and a new bugfix version posted: 1.14.8. However Firefox warned me not to install it from github because it wasn't "verified." I installed it anyway and the problem seems to have been fixed.

This review is for a previous version of the add-on (1.14.4). 

Private Tab

One feature now broken Rated 3 out of 5 stars

The Private Tab extension used to work well... until I updated Firefox to version 52.0 (64-bit). Now, if I have a bookmark with "private:" prefixed to the URL -- e.g. "private:" -- the bookmark no longer works at all. Are other people seeing this too?

This review is for a previous version of the add-on (  This user has 2 previous reviews of this add-on.

CanIUse Search Bar

Useless, always wrong Rated 1 out of 5 stars

I use many search engines in my Firefox search bar. They all work well except this one. It _always_ takes me to the wrong page in I've tried surrounding the search term in quotes but it doesn't help. This is completely useless and I've removed it from my search list.

Now I just go to CanIUse with an ordinary bookmark, and use their built-in search box at the top of the page, which works fine.


Still works in FF42 for me... Rated 5 out of 5 stars


Scrapbook is still working for me in Firefox 42 (on a Mac). I don't have it installed in my VMs so I don't know about Windows or Linux compatibility.

I suppose if you were desperate, you might be able to transfer your Scrapbook data folder to a Mac and run FF+Scrapbook from there. Also it's much easier to print almost anything to a PDF on a Mac (that's built-in to the printing routines), so you might save your data that way.

I haven't installed FF43 which came out recently -- has anybody tried to run Scrapbook there?

This review is for a previous version of the add-on ( 

Private Tab

Tracking protection - which pages? Rated 5 out of 5 stars

@ -1:

I didn't know about clicking the address icon, but now that I try it... I'm seeing approximately the opposite of what you're reporting. Firefox is telling me that Tracking Protection is working for _all_ pages that have tracking elements (including this one), whether they're private windows, private tabs... or ordinary (not private) windows or tabs!

Maybe there's some about:config settings that affect this? Or might the FF alert be feeding off the anti-tracking filter installed in AdBlock Plus or some other extension? Seems unlikely... Moz said they were adding anti-tracking to private windows, not for _all_windows. I have no idea what's going on here.

This review is for a previous version of the add-on (  This user has other reviews of this add-on.

Private Tab

Tip and Question Rated 5 out of 5 stars

wongchunwai said: "its really great. would be prefect if private mode trun on automatically by detecting predefined url/domain."

It does. From the (very limited) documentation: "Also you can create private bookmarks to always open some links in private tabs: just append “private:” before URL, example: private:"

Question: In the newest Firefox 42.0, they've added some anti-tracking features to private windows. I assume that works in private tabs too, but I'm not sure. Does anybody know?

This review is for a previous version of the add-on ( 


Rated 4 out of 5 stars

Although the extension says it's signed, I'm seeing this alert in the FF list: "ColorZilla could not be verified for use in Firefox." I think that means it will break soon... are other users seeing this in their Add-Ons page (extensions list)?

This review is for a previous version of the add-on (2.8.1-signed). 


Broken in Firefox 36? Rated 1 out of 5 stars

Has anyone been able to get version to work in Firefox 36? (I'm on a Mac, but I doubt that matters.) This used to work really well, but since I updated Firefox all it shows is a blank window. :(

This review is for a previous version of the add-on ( 

Font Finder

Shows wrong rendered font Rated 1 out of 5 stars

This extension is worse than useless because, although it shows the correct font stack, it can actually show the wrong rendered font.

For example, I have a stack that starts with Georgia, Times, etc... This extension claims that the font actually rendered is Times, but that's simply untrue; Georgia is available and is being rendered. Although they're fairly similar fonts, I know the difference between the two -- just zoom in on a lower-case "i" or "j" and it's obvious. (I used to teach typographic design.) Anyway, just to make sure I wasn't making a mistake, I checked it against a font book. I wasn't wrong; the extension was.

I don't know what the problem is with this extension. Might it be because I'm using an older version of Mac OSX? (Snow Leopard, 10.6.8.) Hard to believe that would matter... and if there's a compatibility issue, it should just refuse to work at all. Anyway, until they correct this bug, I advise people to avoid it because it could confuse you big-time.

By the way, they do seem to have fixed the entirely different problem I reported back in 2012, in my prior 1-star review. I thought I'd give this another chance now. Oh well.

This review is for a previous version of the add-on (  This user has a previous review of this add-on.


Useless Rated 1 out of 5 stars

Basically useless, because it shows the same never-changing, totally absurd date/timestamp for each item. Also has only one timestamp, not two like the original CacheViewer. Also has an obnoxious huge ?DONATE? button that you can't get rid of.

There are one or two minor added features, but overall this thing is too clunky and buggy to use. The original CacheViewer is pretty poor, but this is even worse.


Rated 3 out of 5 stars

JSOff used to work fine in Mac Firefox, then disappeared no matter what I did. It took me an hour or two to find out what was going on.

I'm still running Firefox 28 (purposely) in both Mac (Snow Leopard) and in Windows 7. JSOff 1.02 still works fine in Windows 7 FF28, but doesn't show up at all, anywhere, in Mac FF28. The Add-Ons Manager shows it as "installed" and active, but there's no button and no way to access it (even during the toolbar "Customize" routine). I even created a new, blank profile in case there was an extensions conflict; made no difference.

I was luckily able to roll back JSOff to the previous version (1.01) and now it works on my Mac again. I guess the developer never bothered testing version 1.02 in Mac Firefox 28.

This user has a previous review of this add-on.


Rated 3 out of 5 stars

I agree with AlenFox. The button in the bottom toolbar is frozen in one position. "Customize..." lets me move most icons where I like, but not this one. Its position is non-customizable in both Mac Firefox and Windows Firefox, although in a slightly different way. In both Firefoxes, I use Status-4-Evar to control the bottom toolbar, if that matters (I doubt that it does). Other than that, it's a very convenient little accessory.

This review is for a previous version of the add-on (0.15.1-signed.1-signed). 

Font Finder

Rated 1 out of 5 stars

I'm using Mac Firefox. Until recently, Font Finder worked fine. In the newest version of Mac Firefox (15.0.1), however, Font Finder only works the first time I use it after launching Firefox. After that, the extension doesn't work. I have to quit and re-launch Firefox each time I want to use Font Finder -- which obviously makes Font Finder completely impractical to use. The highlighting (of the extension's icon, if clicked on, and the text) seems normal, but no informational box pops up at all. Nothing. It (mis)behaves the same way regardless of whether I use the Font Finder contextual menu or the toolbar icon. A shame, really; it was great when it worked.

Does the developer test this in the Mac version? Of course it's possible there's some conflict with another extension I run, since I do run a bunch. Any suggestions would be appreciated; I miss this extension.

This review is for a previous version of the add-on (1.0.1-signed).