I was inspired by some plugins which were not suited for my needs. So I developed that plugin which can be used by Chromium users and also Firefox users.

The extension allows you to refresh a Tab (URL) periodically and automatically.
It can also monitor page content and if specific text on the page either appears or disappears notify you using browser notification with sound (if wished).

In monitor mode, the extension stop refreshing when it find (or loss) a key strings.

Time Intervals
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To refresh a page, Time interval can be fixed or random with default value.

We can also define an Error interval which override Time interval and only used to refresh a Tab after an error occurs (404, 408 and 5xx).

Scheduler
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Any Tab (URL) can be scheduled to begin refreshed at an exact date & time or with countdown timer.

Startup URL
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We can also define an URL which will be opened in new Tab by the extension when the browser starts and then refreshed periodically and automatically.

URL must use http or https protocol; e.g: (http/https)://

Content monitor
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The content of the refreshed page can be monitored after each refresh to check if a some text or keyword on the page either appears or disappears. When happened, notification is displayed and a refresh stopped.

There is a possibility to set a default Text/Regex to monitor. It's useful specially when a Startup URL is set. So each time the page is refreshed, it's content is also monitored.

Internationalization (i18n)
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English and French (you are a welcome to participate in the translation to other languages).