Yes, same problem for me and my colleagues. We used to have 5 x 3 Grid, since Firefox 39 the third row is not visible, unless zoomed out 1 step.

Type about:config in the URL bar and hit Enter. Accept the warning message. Using the Search filed at the top, locate these two preferences.

browser.newtabpage.columns and browser.newtabpage.rows

Right-click each pref under Preference Name and select Modify. Then insert the Value you desire for each pref. You may need to restart Firefox using Exit and then opening it again. I use the New Tab Tools extension for setting those prefs and use a background image for the new tab. https://addons.mozilla.org/en-US/firefox/addon/new-tab-tools/

I'm experiencing the same problem since updating to FF39. "browser.newtabpage.columns" and "browser.newtabpage.rows" are set to 5 and 3, still it's only showing me 4 x 2 tiles instead of 4 x 3 like yesterday with FF38.

Try this. Hit { Ctrl + 0 } (that's the number zero) to reset the zoom factor for that page.

That doesn't solve the problem. The 3.row is not visible since Version 39, unless zoomed out.

With the add-on, the gamma values seem to be off, the previews look too bright for me.

the-edmeister said

Try this. Hit { Ctrl + 0 } (that's the number zero) to reset the zoom factor for that page.

It looks like it's a bug/change with version 39.

the-edmeister said

Type about:config in the URL bar and hit Enter. Accept the warning message. Using the Search filed at the top, locate these two preferences. browser.newtabpage.columns and browser.newtabpage.rows Right-click each pref under Preference Name and select Modify. Then insert the Value you desire for each pref. You may need to restart Firefox using Exit and then opening it again. I use the New Tab Tools extension for setting those prefs and use a background image for the new tab. https://addons.mozilla.org/en-US/firefox/addon/new-tab-tools/

It doesn't work, there are correct numbers in "about"config" preferences. They're just not showing up unless zoomed out. No matter what number you put in browser.newtabpage.rows it shows just two rows without zooming.

the-edmeister said

Type about:config in the URL bar and hit Enter. Accept the warning message. Using the Search filed at the top, locate these two preferences. browser.newtabpage.columns and browser.newtabpage.rows Right-click each pref under Preference Name and select Modify. Then insert the Value you desire for each pref. You may need to restart Firefox using Exit and then opening it again. I use the New Tab Tools extension for setting those prefs and use a background image for the new tab. https://addons.mozilla.org/en-US/firefox/addon/new-tab-tools/

It actually appears that this only partly works. Both are set to 3(rows) and 5 (Columns) but still only shows up with 10 instead of 15. Will try that addon.

I have experienced the same issue since 'upgrading' to FF39. It thus seems unanimous so far that the suggested about:config workaround is not going to solve this issue. Does anyone know how to get any feedback from Mozilla directly? It would seem straightforward for Mozilla to allow a zoom out feature that applies only to tab pages.

I tried the workaround described in this thread by Scribe. It works, but everything looks too small.

I am running Windows 7, as the OP in this thread is running, and I see an issue when the Firefox browser window is not maximized. Maximized (without the Bookmarks Toolbar showing) I see 5 columns and 3 rows with default settings in about:config @ 1600x900 resolution. As soon as I minimize the window, even though it is taking up the full monitor (with the Windows Taskbar unlocked) I lose one row of tiles. With the Bookmarks Toolbar showing I lose two rows when Maximized and lose one column = 3 tiles appear on one row.

I can't say if that differs from Firefox 38 or not, as I rarely open my "default" Profile and my "working" Profiles all have the New Tab Tools extension installed.

IMHO something with the Bookmarks Toolbar is screwing up the tiles rows and columns, at least from what I am seeing. And now after showing and then hiding the BTB again I am stuck with one row or 4 tiles, even after restarting Firefox 39 - like it permanently is "broken" now.

"Someone" needs to file a Bug report, IMO. https://developer.mozilla.org/en/Bug_writing_guidelines

Personally, I am so thoroughly disgusted with the "path" Firefox is now on that I "bow out" from filing any Bug reports, especially if the manner in which I use Firefox isn't directly affected by what I see as a Bug. Too many years of Bug reports that I have filed not leading to my "perceived Bug" even being discussed seriously, much less fixed as I expected. And when the day comes that I can't find an extension to "fix" what I find wrong, I'll either learn to live with it or seek out an alternative browser to use - something I have been swearing to do since Firefox 4.0 was released over 4 years ago.

Thanks go to Garlino and the-edmeister for their respective interventions. My Firefox is on Windows 8, so it is clear that the issue is not the operating system. I am going to try and file a 'bug report' as suggested by the-edmeister. If some others do this as well, it is possible Mozilla will notice and take it more seriously. No one wants to zoom in to 80% or more just to take advantage of the tiles available on tab pages.

Sounds like we should file a bug. JamesPhillipCasey what is the bug number? Thanks!

One person should file a Bug report and hyperlink that report in this forum; then others with this fault should post in that Bug report to confirm. Posting multiple Bug reports about the same issue isn't going to "impress" the triage team. On the contrary multiple identical / duplicate reports may tend to slow down the response because once the triage team "assigns" the report to the module owner, everyone associated with that module will get a message about that Bug => better off letting the developers spend their time fixing stuff instead of reading the duplicated Bug reports.

Quite honestly it is my considered opinion that the new tab page and those tiles isn't a "real feature" for Firefox users any longer. It's a way of generating revenue for Mozilla (which is can use to expand what they do) with some screened advertisement content inserted when the user doesn't have enough browsing history to fill all the tiles. My advice is to set a different new tab page or use an extension to enhance and 'fix' the new tab page.

This may cover the issue: https://bugzilla.mozilla.org/show_bug.cgi?id=1180387.

I'll link to this support question from that bug and we can go from there.

Thank you posting that Bug report link.

Same problem with me!!! zooming out DID NOT help as it ALWAYS reverts the zoom, closing Firefox or not, DOESN'T MATTER!!!