nsIStyleSheetService - The Gateway to Stylish CSS

I am currently utilizing nsIStyleSheetService within my Firefox extension to apply a custom stylesheet to every webpage. While everything is functioning properly, there are a few styles that are not being applied as expected.

One of the styles causing issues involves adding a form with inputs and textareas, but the appearance remains unchanged. I attempted to include the `important` rule, but that did not resolve the problem. Any insight into what I might be doing incorrectly?

Upon conducting some tests, I have discovered that the following styles are not being applied:

background-color:#f3f3ec;
border:1px solid #d1d1cf;
-moz-border-radius: 10px;

It is peculiar that the styles function as intended when loading the CSS directly on the page, but utilizing nsIStyleSheetService inhibits their application. I find this situation quite puzzling. :( Even after attempting to change the colors, the issue remained unresolved.

.MyToolTipWrapper input,
.MyToolTipWrapper textarea {
    background-color:#f3f3ec;
    border:1px solid #d1d1cf;
    font-family:Arial, Helvetica, sans-serif;
    font-size:12px;
    width:97%;
    padding:5px;
    -moz-border-radius: 10px;
}

Below is my initialization script:

var sss = Cc["@mozilla.org/content/style-sheet-service;1"].getService(Ci.nsIStyleSheetService);
var uri = makeURI("resource://newtooltip/newtooltip.css");
if (sss.sheetRegistered(uri, sss.USER_SHEET))
    sss.unregisterSheet(uri, sss.USER_SHEET);
if (on)
    sss.loadAndRegisterSheet(uri, sss.USER_SHEET);

Answer №1

In the realm of CSS 2.1, it is firmly established that user agent stylesheets are equipped with a lower hierarchical standing compared to the stylesheets set forth by the web page itself - unless the mighty !important flag is unfurled. In your specific scenario, it is highly likely that the web page has already proclaimed a decree on the matter of background-color, thereby snuffing out any aspirations held by your user stylesheet. To rectify this imbalance, the deployment of !important is the prescribed remedy to ensure the supremacy of your edicts:

background-color:#f3f3ec !important;
border:1px solid #d1d1cf !important;
-moz-border-radius: 10px !important;

Answer №2

When utilizing USER_SHEET, keep in mind that the CSS rules of the Website will take precedence over your own. Consider switching to AGENT_SHEET for increased priority of your CSS.

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