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Add-on dev: How can I edit Firefox UI CSS?

I'm developing an add-on for Firefox which will take the colors from the favicon of the current tab to color bits of the tab-bar dynamically. I'm having trouble finding o… (read more)

I'm developing an add-on for Firefox which will take the colors from the favicon of the current tab to color bits of the tab-bar dynamically.

I'm having trouble finding out how I can modify browser CSS, for example in the Browser Tool box console, this works perfectly fine: ```const activeTab = document.querySelector('.tabbrowser-tab[selected="true"] .tab-background'); activeTab.style.background = "rgb(0, 221, 255)";```

but when inputting this same code in my add-on, it cannot query that same selector (I've given it tabs and theme permissions). This also does not work as a stylesheet.

Can anyone point me to what I need to access the browser UI DOM?

Asked by dukevin 12 hours ago

Firefox Update broke my company's printing config

Hello, since the latest update I experience problems with printing. In my store we print hundreds of little slips every day, they are the size of 1/3 of A4 format. The w… (read more)

Hello,

since the latest update I experience problems with printing. In my store we print hundreds of little slips every day, they are the size of 1/3 of A4 format.

The webapp which prints them generates an A4 PDF, where only the top 1/3rd of the page is actually filled with information. Usually we print this via systems dialog, we have it set to print on Letter DL format, change the orientation 90 degrees and zoom to 270%, which gives us a perfect result.

As of yesterdays update, Firefox somehow changed the alignment rules, and the zoomed-in page now gets centred instead of aligned left, which completely breaks our process.

Is there any way to force left alignment? This is affecting two different machines exactly on the day of the update rollout. Changelog only says the print margins have been changed but I believe also the alignment has been affected by that.

Thx

Asked by info5314 10 hours ago

Use "open image in new tab" but staying on the current tab

Hi, The right-click context menu has a "open image in new tab" option with a handy keyboard shortcut, however using it one goes in to the new tab with the opened image. … (read more)

Hi,

The right-click context menu has a "open image in new tab" option with a handy keyboard shortcut, however using it one goes in to the new tab with the opened image. Is there any way to use the "open image in new tab" but staying in the current tab?

Thanks.

Asked by impar 8 hours ago

Right Click [W} Open Link New Window, changed to [D].

From the very start, for the last 25+ years, Right Click a link, and hit the letter W to open the link in a new window... Suddenly, with 88 Update, it is now the letter … (read more)

From the very start, for the last 25+ years, Right Click a link, and hit the letter W to open the link in a new window... Suddenly, with 88 Update, it is now the letter D. (while everything else in Windows is still W)

How do I get it back to [W] (Industry Standard is W)

Why did Mozilla change the letter to D?

I don't mind having to train myself to use D instead of W... I do mind that everything else still uses W, so I have to train myself to only use D in Firefox.

Asked by wizflip 5 hours ago